MONOSPLINE

Updated 2023-10-17 19:35:01

Syntax

SELECT [westclintech].[wct].[MONOSPLINE] (
  <@known_x, float,>
 ,<@known_y, float,>
 ,<@new_x, float,>)

Description

Use the aggregate function MONOSPLINE to calculate the interpolated value of y given x in the array (x, y). MONOSPLINE is an implementation of Monotonic Piecewise Cubic Interpolation by F. N. Fritsch and R. E. Carlson, SIAM Journal on Numerical Analysis, Vol. 17, No.2 (Apr., 1980), pp. 238–246.

Arguments

@known_y

the y-values to be used in the interpolation calculation. @known_y must be of the type float or of a type that implicitly converts to float.

@new_x

the new x-value for which you want MONOSPLINE to calculate the y-value.

@known_x

the x-values to be used in the interpolation calculation. @known_x must be of the type float or of a type that implicitly converts to float.

Return Type

float

Remarks

For linear interpolation use the INTERP function.

For cubic spline interpolation use the SPLINE function.

For polynomial interpolation use the POLYINTERP function.

If an x-y pair contains a NULL, then the pair is not used in the interpolation calculation.

If a @known_x value occurs more than once in the dataset and error message will be generated.

If @new_x is less than the minimum @known_x then the @known_y value for the minimum @known_x will be returned.

If @new_x is greater than the maximum @known_x then the @known_y value for the maximum @known_x will be returned.

@new_x must remain invariant for the GROUP.

Examples

In this example, we will use the data provided by Fritsch and Carlson in their paper and compare the monotonic cubic spline to the natural cubic spline. We will generate new x-values in the range 8 to 20 in increments of 0.1 using the SeriesFloat function.

SELECT k.seriesvalue as new_x,

       wct.SPLINE(x, y, k.seriesvalue) as Spline,

       wct.MONOSPLINE(x, y, k.seriesvalue) as [Monotonic Spline]

FROM

(

    VALUES

        (7.99, 0),

        (8.09, 2.76429E-05),

        (8.19, 4.37498E-02),

        (8.7, 0.169183),

        (9.2, 0.469428),

        (10, 0.943740),

        (12, 0.998636),

        (15, 0.999919),

        (20, 0.999994)

) n (x, y)

    CROSS APPLY wct.SeriesFloat(8, 20, 0.1, NULL, NULL) k

GROUP BY k.seriesvalue;

Here is the resultant table.

{"columns":[{"field":"new_x","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"Monotonic Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"new_x":"8","Spline":"-0.00116989877918428","Monotonic Spline":"3.61319197537074E-08"},{"new_x":"8.1","Spline":"0.00273924504325517","Monotonic Spline":"0.000951154458245464"},{"new_x":"8.2","Spline":"0.048460047888164","Monotonic Spline":"0.0470944305509381"},{"new_x":"8.3","Spline":"0.0850635348767606","Monotonic Spline":"0.0739767196752986"},{"new_x":"8.4","Spline":"0.107873086590444","Monotonic Spline":"0.0933312578716672"},{"new_x":"8.5","Spline":"0.124453190021013","Monotonic Spline":"0.111453508450762"},{"new_x":"8.6","Spline":"0.142368332160266","Monotonic Spline":"0.1346389347233"},{"new_x":"8.7","Spline":"0.169183","Monotonic Spline":"0.169183"},{"new_x":"8.8","Spline":"0.210605054376664","Monotonic Spline":"0.217947438431373"},{"new_x":"8.9","Spline":"0.264915851505302","Monotonic Spline":"0.276699868235295"},{"new_x":"9","Spline":"0.328540121445608","Monotonic Spline":"0.34109457882353"},{"new_x":"9.1","Spline":"0.397902594257276","Monotonic Spline":"0.406785859607843"},{"new_x":"9.2","Spline":"0.469428","Monotonic Spline":"0.469428"},{"new_x":"9.3","Spline":"0.54003574756429","Monotonic Spline":"0.534592942314008"},{"new_x":"9.4","Spline":"0.608623961163908","Monotonic Spline":"0.60758208793374"},{"new_x":"9.5","Spline":"0.674585443843436","Monotonic Spline":"0.683643914875762"},{"new_x":"9.6","Spline":"0.737312998647453","Monotonic Spline":"0.758026901156639"},{"new_x":"9.7","Spline":"0.796199428620538","Monotonic Spline":"0.825979524792936"},{"new_x":"9.8","Spline":"0.850637536807272","Monotonic Spline":"0.882750263801219"},{"new_x":"9.9","Spline":"0.900020126252232","Monotonic Spline":"0.923587596198052"},{"new_x":"10","Spline":"0.94374","Monotonic Spline":"0.94374"},{"new_x":"10.1","Spline":"0.981353055111755","Monotonic Spline":"0.951555966851365"},{"new_x":"10.2","Spline":"1.01306756471508","Monotonic Spline":"0.958580315413437"},{"new_x":"10.3","Spline":"1.03925489595415","Monotonic Spline":"0.96485601422827"},{"new_x":"10.4","Spline":"1.06028641597315","Monotonic Spline":"0.970426031837912"},{"new_x":"10.5","Spline":"1.07653349191627","Monotonic Spline":"0.975333336784416"},{"new_x":"10.6","Spline":"1.08836749092768","Monotonic Spline":"0.979620897609832"},{"new_x":"10.7","Spline":"1.09615978015157","Monotonic Spline":"0.983331682856211"},{"new_x":"10.8","Spline":"1.10028172673211","Monotonic Spline":"0.986508661065605"},{"new_x":"10.9","Spline":"1.1011046978135","Monotonic Spline":"0.989194800780063"},{"new_x":"11","Spline":"1.0990000605399","Monotonic Spline":"0.991433070541638"},{"new_x":"11.1","Spline":"1.09433918205551","Monotonic Spline":"0.99326643889238"},{"new_x":"11.2","Spline":"1.08749342950449","Monotonic Spline":"0.994737874374341"},{"new_x":"11.3","Spline":"1.07883417003105","Monotonic Spline":"0.99589034552957"},{"new_x":"11.4","Spline":"1.06873277077935","Monotonic Spline":"0.99676682090012"},{"new_x":"11.5","Spline":"1.05756059889358","Monotonic Spline":"0.997410269028041"},{"new_x":"11.6","Spline":"1.04568902151792","Monotonic Spline":"0.997863658455384"},{"new_x":"11.7","Spline":"1.03348940579655","Monotonic Spline":"0.998169957724201"},{"new_x":"11.8","Spline":"1.02133311887365","Monotonic Spline":"0.998372135376542"},{"new_x":"11.9","Spline":"1.00959152789341","Monotonic Spline":"0.998513159954458"},{"new_x":"12","Spline":"0.998636","Monotonic Spline":"0.998636"},{"new_x":"12.1","Spline":"0.988768363391917","Monotonic Spline":"0.998759714212121"},{"new_x":"12.2","Spline":"0.980012290484874","Monotonic Spline":"0.998874924277727"},{"new_x":"12.3","Spline":"0.972321914748893","Monotonic Spline":"0.998981943220802"},{"new_x":"12.4","Spline":"0.965651369653995","Monotonic Spline":"0.999081084065328"},{"new_x":"12.5","Spline":"0.959954788670204","Monotonic Spline":"0.999172659835288"},{"new_x":"12.6","Spline":"0.955186305267542","Monotonic Spline":"0.999256983554665"},{"new_x":"12.7","Spline":"0.95130005291603","Monotonic Spline":"0.999334368247441"},{"new_x":"12.8","Spline":"0.948250165085692","Monotonic Spline":"0.9994051269376"},{"new_x":"12.9","Spline":"0.945990775246548","Monotonic Spline":"0.999469572649124"},{"new_x":"13","Spline":"0.944476016868622","Monotonic Spline":"0.999528018405996"},{"new_x":"13.1","Spline":"0.943660023421936","Monotonic Spline":"0.999580777232199"},{"new_x":"13.2","Spline":"0.943496928376512","Monotonic Spline":"0.999628162151715"},{"new_x":"13.3","Spline":"0.943940865202372","Monotonic Spline":"0.999670486188527"},{"new_x":"13.4","Spline":"0.944945967369538","Monotonic Spline":"0.999708062366619"},{"new_x":"13.5","Spline":"0.946466368348033","Monotonic Spline":"0.999741203709972"},{"new_x":"13.6","Spline":"0.948456201607878","Monotonic Spline":"0.99977022324257"},{"new_x":"13.7","Spline":"0.950869600619097","Monotonic Spline":"0.999795433988396"},{"new_x":"13.8","Spline":"0.953660698851711","Monotonic Spline":"0.999817148971432"},{"new_x":"13.9","Spline":"0.956783629775742","Monotonic Spline":"0.999835681215661"},{"new_x":"14","Spline":"0.960192526861213","Monotonic Spline":"0.999851343745065"},{"new_x":"14.1","Spline":"0.963841523578146","Monotonic Spline":"0.999864449583629"},{"new_x":"14.2","Spline":"0.967684753396563","Monotonic Spline":"0.999875311755334"},{"new_x":"14.3","Spline":"0.971676349786487","Monotonic Spline":"0.999884243284163"},{"new_x":"14.4","Spline":"0.97577044621794","Monotonic Spline":"0.999891557194099"},{"new_x":"14.5","Spline":"0.979921176160943","Monotonic Spline":"0.999897566509125"},{"new_x":"14.6","Spline":"0.984082673085519","Monotonic Spline":"0.999902584253224"},{"new_x":"14.7","Spline":"0.988209070461691","Monotonic Spline":"0.999906923450378"},{"new_x":"14.8","Spline":"0.99225450175948","Monotonic Spline":"0.99991089712457"},{"new_x":"14.9","Spline":"0.996173100448909","Monotonic Spline":"0.999914818299783"},{"new_x":"15","Spline":"0.999919","Monotonic Spline":"0.999919"},{"new_x":"15.1","Spline":"1.00345470685667","Monotonic Spline":"0.9999233132867"},{"new_x":"15.2","Spline":"1.00677621935838","Monotonic Spline":"0.999927424186972"},{"new_x":"15.3","Spline":"1.00988790881852","Monotonic Spline":"0.999931338173216"},{"new_x":"15.4","Spline":"1.01279414655043","Monotonic Spline":"0.999935060717834"},{"new_x":"15.5","Spline":"1.0154993038675","Monotonic Spline":"0.999938597293224"},{"new_x":"15.6","Spline":"1.01800775208308","Monotonic Spline":"0.999941953371786"},{"new_x":"15.7","Spline":"1.02032386251054","Monotonic Spline":"0.99994513442592"},{"new_x":"15.8","Spline":"1.02245200646326","Monotonic Spline":"0.999948145928027"},{"new_x":"15.9","Spline":"1.02439655525458","Monotonic Spline":"0.999950993350506"},{"new_x":"16","Spline":"1.02616188019789","Monotonic Spline":"0.999953682165757"},{"new_x":"16.1","Spline":"1.02775235260655","Monotonic Spline":"0.99995621784618"},{"new_x":"16.2","Spline":"1.02917234379392","Monotonic Spline":"0.999958605864175"},{"new_x":"16.3","Spline":"1.03042622507337","Monotonic Spline":"0.999960851692142"},{"new_x":"16.4","Spline":"1.03151836775826","Monotonic Spline":"0.99996296080248"},{"new_x":"16.5","Spline":"1.03245314316197","Monotonic Spline":"0.999964938667591"},{"new_x":"16.6","Spline":"1.03323492259786","Monotonic Spline":"0.999966790759872"},{"new_x":"16.7","Spline":"1.03386807737929","Monotonic Spline":"0.999968522551726"},{"new_x":"16.8","Spline":"1.03435697881963","Monotonic Spline":"0.999970139515551"},{"new_x":"16.9","Spline":"1.03470599823226","Monotonic Spline":"0.999971647123747"},{"new_x":"17","Spline":"1.03491950693052","Monotonic Spline":"0.999973050848715"},{"new_x":"17.1","Spline":"1.0350018762278","Monotonic Spline":"0.999974356162853"},{"new_x":"17.2","Spline":"1.03495747743745","Monotonic Spline":"0.999975568538563"},{"new_x":"17.3","Spline":"1.03479068187285","Monotonic Spline":"0.999976693448244"},{"new_x":"17.4","Spline":"1.03450586084736","Monotonic Spline":"0.999977736364296"},{"new_x":"17.5","Spline":"1.03410738567434","Monotonic Spline":"0.999978702759119"},{"new_x":"17.6","Spline":"1.03359962766716","Monotonic Spline":"0.999979598105113"},{"new_x":"17.7","Spline":"1.0329869581392","Monotonic Spline":"0.999980427874677"},{"new_x":"17.8","Spline":"1.0322737484038","Monotonic Spline":"0.999981197540212"},{"new_x":"17.9","Spline":"1.03146436977435","Monotonic Spline":"0.999981912574117"},{"new_x":"18","Spline":"1.03056319356421","Monotonic Spline":"0.999982578448794"},{"new_x":"18.1","Spline":"1.02957459108674","Monotonic Spline":"0.99998320063664"},{"new_x":"18.2","Spline":"1.02850293365531","Monotonic Spline":"0.999983784610057"},{"new_x":"18.3","Spline":"1.02735259258328","Monotonic Spline":"0.999984335841444"},{"new_x":"18.4","Spline":"1.02612793918403","Monotonic Spline":"0.999984859803202"},{"new_x":"18.5","Spline":"1.02483334477092","Monotonic Spline":"0.999985361967729"},{"new_x":"18.6","Spline":"1.02347318065731","Monotonic Spline":"0.999985847807426"},{"new_x":"18.7","Spline":"1.02205181815658","Monotonic Spline":"0.999986322794694"},{"new_x":"18.8","Spline":"1.02057362858208","Monotonic Spline":"0.999986792401931"},{"new_x":"18.9","Spline":"1.01904298324718","Monotonic Spline":"0.999987262101538"},{"new_x":"19","Spline":"1.01746425346526","Monotonic Spline":"0.999987737365915"},{"new_x":"19.1","Spline":"1.01584181054967","Monotonic Spline":"0.999988223667462"},{"new_x":"19.2","Spline":"1.01418002581379","Monotonic Spline":"0.999988726478578"},{"new_x":"19.3","Spline":"1.01248327057098","Monotonic Spline":"0.999989251271663"},{"new_x":"19.4","Spline":"1.0107559161346","Monotonic Spline":"0.999989803519118"},{"new_x":"19.5","Spline":"1.00900233381803","Monotonic Spline":"0.999990388693342"},{"new_x":"19.6","Spline":"1.00722689493462","Monotonic Spline":"0.999991012266735"},{"new_x":"19.7","Spline":"1.00543397079775","Monotonic Spline":"0.999991679711698"},{"new_x":"19.8","Spline":"1.00362793272077","Monotonic Spline":"0.99999239650063"},{"new_x":"19.9","Spline":"1.00181315201707","Monotonic Spline":"0.99999316810593"},{"new_x":"20","Spline":"0.999994","Monotonic Spline":"0.999994"}]}

Here’s a graph of the resultant table using Excel.

If we had simply wanted to get an interpolated value for a single point, we could have entered the following SQL.

SELECT wct.MONOSPLINE(x, y, 12.5) as [Monotonic Spline]

FROM

(

    VALUES

        (7.99, 0),

        (8.09, 2.76429E-05),

        (8.19, 4.37498E-02),

        (8.7, 0.169183),

        (9.2, 0.469428),

        (10, 0.943740),

        (12, 0.998636),

        (15, 0.999919),

        (20, 0.999994)

) n (x, y);

This produces the following result.

{"columns":[{"field":"Monotonic Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"Monotonic Spline":"0.999172659835288"}]}

Here is another example.

SELECT k.seriesvalue as new_x,

       wct.SPLINE(x, y, k.seriesvalue) as Spline,

       wct.MONOSPLINE(x, y, k.seriesvalue) as [Monotonic Spline]

FROM

(

    VALUES

        (0, 10),

        (2, 10),

        (3, 10),

        (5, 10),

        (6, 10),

        (8, 10),

        (9, 10.5),

        (11, 15),

        (12, 50),

        (14, 60),

        (15, 85)

) n (x, y)

    CROSS APPLY wct.SeriesFloat(0, 15, 0.1, NULL, NULL) k

GROUP BY k.seriesvalue;

Here is the resultant table.

{"columns":[{"field":"new_x","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"Monotonic Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"new_x":"0","Spline":"10","Monotonic Spline":"10"},{"new_x":"0.1","Spline":"9.9996055959123","Monotonic Spline":"10"},{"new_x":"0.2","Spline":"9.99921712271314","Monotonic Spline":"10"},{"new_x":"0.3","Spline":"9.99884051129106","Monotonic Spline":"10"},{"new_x":"0.4","Spline":"9.99848169253458","Monotonic Spline":"10"},{"new_x":"0.5","Spline":"9.99814659733225","Monotonic Spline":"10"},{"new_x":"0.6","Spline":"9.99784115657261","Monotonic Spline":"10"},{"new_x":"0.7","Spline":"9.99757130114418","Monotonic Spline":"10"},{"new_x":"0.8","Spline":"9.99734296193552","Monotonic Spline":"10"},{"new_x":"0.9","Spline":"9.99716206983514","Monotonic Spline":"10"},{"new_x":"1","Spline":"9.9970345557316","Monotonic Spline":"10"},{"new_x":"1.1","Spline":"9.99696635051343","Monotonic Spline":"10"},{"new_x":"1.2","Spline":"9.99696338506916","Monotonic Spline":"10"},{"new_x":"1.3","Spline":"9.99703159028733","Monotonic Spline":"10"},{"new_x":"1.4","Spline":"9.99717689705649","Monotonic Spline":"10"},{"new_x":"1.5","Spline":"9.99740523626515","Monotonic Spline":"10"},{"new_x":"1.6","Spline":"9.99772253880187","Monotonic Spline":"10"},{"new_x":"1.7","Spline":"9.99813473555518","Monotonic Spline":"10"},{"new_x":"1.8","Spline":"9.99864775741361","Monotonic Spline":"10"},{"new_x":"1.9","Spline":"9.99926753526571","Monotonic Spline":"10"},{"new_x":"2","Spline":"10","Monotonic Spline":"10"},{"new_x":"2.1","Spline":"10.0008362552837","Monotonic Spline":"10"},{"new_x":"2.2","Spline":"10.0017080958986","Monotonic Spline":"10"},{"new_x":"2.3","Spline":"10.0025324894052","Monotonic Spline":"10"},{"new_x":"2.4","Spline":"10.003226403364","Monotonic Spline":"10"},{"new_x":"2.5","Spline":"10.0037068053355","Monotonic Spline":"10"},{"new_x":"2.6","Spline":"10.0038906628801","Monotonic Spline":"10"},{"new_x":"2.7","Spline":"10.0036949435584","Monotonic Spline":"10"},{"new_x":"2.8","Spline":"10.0030366149308","Monotonic Spline":"10"},{"new_x":"2.9","Spline":"10.0018326445579","Monotonic Spline":"10"},{"new_x":"3","Spline":"10","Monotonic Spline":"10"},{"new_x":"3.1","Spline":"9.99749271687107","Monotonic Spline":"10"},{"new_x":"3.2","Spline":"9.99441310299834","Monotonic Spline":"10"},{"new_x":"3.3","Spline":"9.99090053426242","Monotonic Spline":"10"},{"new_x":"3.4","Spline":"9.98709438654393","Monotonic Spline":"10"},{"new_x":"3.5","Spline":"9.98313403572349","Monotonic Spline":"10"},{"new_x":"3.6","Spline":"9.9791588576817","Monotonic Spline":"10"},{"new_x":"3.7","Spline":"9.97530822829919","Monotonic Spline":"10"},{"new_x":"3.8","Spline":"9.97172152345656","Monotonic Spline":"10"},{"new_x":"3.9","Spline":"9.96853811903443","Monotonic Spline":"10"},{"new_x":"4","Spline":"9.96589739091343","Monotonic Spline":"10"},{"new_x":"4.1","Spline":"9.96393871497415","Monotonic Spline":"10"},{"new_x":"4.2","Spline":"9.96280146709722","Monotonic Spline":"10"},{"new_x":"4.3","Spline":"9.96262502316325","Monotonic Spline":"10"},{"new_x":"4.4","Spline":"9.96354875905286","Monotonic Spline":"10"},{"new_x":"4.5","Spline":"9.96571205064665","Monotonic Spline":"10"},{"new_x":"4.6","Spline":"9.96925427382525","Monotonic Spline":"10"},{"new_x":"4.7","Spline":"9.97431480446927","Monotonic Spline":"10"},{"new_x":"4.8","Spline":"9.98103301845933","Monotonic Spline":"10"},{"new_x":"4.9","Spline":"9.98954829167603","Monotonic Spline":"10"},{"new_x":"5","Spline":"10","Monotonic Spline":"10"},{"new_x":"5.1","Spline":"10.012285835604","Monotonic Spline":"10"},{"new_x":"5.2","Spline":"10.0253367558292","Monotonic Spline":"10"},{"new_x":"5.3","Spline":"10.037842034309","Monotonic Spline":"10"},{"new_x":"5.4","Spline":"10.0484909446768","Monotonic Spline":"10"},{"new_x":"5.5","Spline":"10.055972760566","Monotonic Spline":"10"},{"new_x":"5.6","Spline":"10.0589767556099","Monotonic Spline":"10"},{"new_x":"5.7","Spline":"10.0561922034419","Monotonic Spline":"10"},{"new_x":"5.8","Spline":"10.0463083776953","Monotonic Spline":"10"},{"new_x":"5.9","Spline":"10.0280145520036","Monotonic Spline":"10"},{"new_x":"6","Spline":"10","Monotonic Spline":"10"},{"new_x":"6.1","Spline":"9.96153151558928","Monotonic Spline":"10"},{"new_x":"6.2","Spline":"9.91418597376111","Monotonic Spline":"10"},{"new_x":"6.3","Spline":"9.86011776977648","Monotonic Spline":"10"},{"new_x":"6.4","Spline":"9.80148129889639","Monotonic Spline":"10"},{"new_x":"6.5","Spline":"9.74043095638182","Monotonic Spline":"10"},{"new_x":"6.6","Spline":"9.67912113749376","Monotonic Spline":"10"},{"new_x":"6.7","Spline":"9.61970623749322","Monotonic Spline":"10"},{"new_x":"6.8","Spline":"9.56434065164116","Monotonic Spline":"10"},{"new_x":"6.9","Spline":"9.5151787751986","Monotonic Spline":"10"},{"new_x":"7","Spline":"9.47437500342652","Monotonic Spline":"10"},{"new_x":"7.1","Spline":"9.4440837315859","Monotonic Spline":"10"},{"new_x":"7.2","Spline":"9.42645935493775","Monotonic Spline":"10"},{"new_x":"7.3","Spline":"9.42365626874305","Monotonic Spline":"10"},{"new_x":"7.4","Spline":"9.43782886826278","Monotonic Spline":"10"},{"new_x":"7.5","Spline":"9.47113154875796","Monotonic Spline":"10"},{"new_x":"7.6","Spline":"9.52571870548955","Monotonic Spline":"10"},{"new_x":"7.7","Spline":"9.60374473371857","Monotonic Spline":"10"},{"new_x":"7.8","Spline":"9.70736402870598","Monotonic Spline":"10"},{"new_x":"7.9","Spline":"9.8387309857128","Monotonic Spline":"10"},{"new_x":"8","Spline":"10","Monotonic Spline":"10"},{"new_x":"8.1","Spline":"10.1900941965779","Monotonic Spline":"10.0095272727487"},{"new_x":"8.2","Spline":"10.3950116194538","Monotonic Spline":"10.0360969697731"},{"new_x":"8.3","Spline":"10.5975190423846","Monotonic Spline":"10.0766909092408"},{"new_x":"8.4","Spline":"10.780383239127","Monotonic Spline":"10.1282909093194"},{"new_x":"8.5","Spline":"10.9263709834376","Monotonic Spline":"10.1878787881763"},{"new_x":"8.6","Spline":"11.0182490490732","Monotonic Spline":"10.2524363639791"},{"new_x":"8.7","Spline":"11.0387842097905","Monotonic Spline":"10.3189454548953"},{"new_x":"8.8","Spline":"10.9707432393463","Monotonic Spline":"10.3843878790925"},{"new_x":"8.9","Spline":"10.7968929114972","Monotonic Spline":"10.4457454547382"},{"new_x":"9","Spline":"10.5","Monotonic Spline":"10.5"},{"new_x":"9.1","Spline":"10.0706832747627","Monotonic Spline":"10.5455010329962"},{"new_x":"9.2","Spline":"9.53096949029884","Monotonic Spline":"10.5853388431699"},{"new_x":"9.3","Spline":"8.91073739727304","Monotonic Spline":"10.6236064056759"},{"new_x":"9.4","Spline":"8.23986574635007","Monotonic Spline":"10.6643966956687"},{"new_x":"9.5","Spline":"7.54823328819469","Monotonic Spline":"10.7118026883032"},{"new_x":"9.6","Spline":"6.86571877347163","Monotonic Spline":"10.769917358734"},{"new_x":"9.7","Spline":"6.22220095284565","Monotonic Spline":"10.8428336821157"},{"new_x":"9.8","Spline":"5.64755857698148","Monotonic Spline":"10.9346446336031"},{"new_x":"9.9","Spline":"5.17167039654388","Monotonic Spline":"11.0494431883508"},{"new_x":"10","Spline":"4.82441516219757","Monotonic Spline":"11.1913223215136"},{"new_x":"10.1","Spline":"4.63567162460732","Monotonic Spline":"11.3643750082461"},{"new_x":"10.2","Spline":"4.63531853443786","Monotonic Spline":"11.5726942237031"},{"new_x":"10.3","Spline":"4.85323464235394","Monotonic Spline":"11.8203729430391"},{"new_x":"10.4","Spline":"5.31929869902029","Monotonic Spline":"12.1115041414089"},{"new_x":"10.5","Spline":"6.06338945510167","Monotonic Spline":"12.4501807939672"},{"new_x":"10.6","Spline":"7.11538566126284","Monotonic Spline":"12.8404958758687"},{"new_x":"10.7","Spline":"8.5051660681685","Monotonic Spline":"13.286542362268"},{"new_x":"10.8","Spline":"10.2626094264834","Monotonic Spline":"13.7924132283199"},{"new_x":"10.9","Spline":"12.4175944868723","Monotonic Spline":"14.362201449179"},{"new_x":"11","Spline":"15","Monotonic Spline":"15"},{"new_x":"11.1","Spline":"18.0187992113531","Monotonic Spline":"16.4172661130914"},{"new_x":"11.2","Spline":"21.3993433457054","Monotonic Spline":"19.1176550922926"},{"new_x":"11.3","Spline":"25.0460781226529","Monotonic Spline":"22.7935570200547"},{"new_x":"11.4","Spline":"28.8634492617913","Monotonic Spline":"27.1373619788291"},{"new_x":"11.5","Spline":"32.7559024827167","Monotonic Spline":"31.8414600510669"},{"new_x":"11.6","Spline":"36.6278835050247","Monotonic Spline":"36.5982413192195"},{"new_x":"11.7","Spline":"40.3838380483112","Monotonic Spline":"41.1000958657378"},{"new_x":"11.8","Spline":"43.928211832172","Monotonic Spline":"45.0394137730732"},{"new_x":"11.9","Spline":"47.165450576203","Monotonic Spline":"48.1085851236768"},{"new_x":"12","Spline":"50","Monotonic Spline":"50"},{"new_x":"12.1","Spline":"52.3594342432333","Monotonic Spline":"51.11275"},{"new_x":"12.2","Spline":"54.263841125871","Monotonic Spline":"52.062"},{"new_x":"12.3","Spline":"55.7564368879557","Monotonic Spline":"52.86425"},{"new_x":"12.4","Spline":"56.8804377695298","Monotonic Spline":"53.536"},{"new_x":"12.5","Spline":"57.6790600106359","Monotonic Spline":"54.09375"},{"new_x":"12.6","Spline":"58.1955198513166","Monotonic Spline":"54.554"},{"new_x":"12.7","Spline":"58.4730335316144","Monotonic Spline":"54.93325"},{"new_x":"12.8","Spline":"58.5548172915719","Monotonic Spline":"55.248"},{"new_x":"12.9","Spline":"58.4840873712315","Monotonic Spline":"55.51475"},{"new_x":"13","Spline":"58.3040600106359","Monotonic Spline":"55.75"},{"new_x":"13.1","Spline":"58.0579514498276","Monotonic Spline":"55.97025"},{"new_x":"13.2","Spline":"57.7889779288491","Monotonic Spline":"56.192"},{"new_x":"13.3","Spline":"57.5403556877429","Monotonic Spline":"56.43175"},{"new_x":"13.4","Spline":"57.3553009665517","Monotonic Spline":"56.706"},{"new_x":"13.5","Spline":"57.277030005318","Monotonic Spline":"57.03125"},{"new_x":"13.6","Spline":"57.3487590440842","Monotonic Spline":"57.424"},{"new_x":"13.7","Spline":"57.613704322893","Monotonic Spline":"57.90075"},{"new_x":"13.8","Spline":"58.1150820817868","Monotonic Spline":"58.478"},{"new_x":"13.9","Spline":"58.8961085608083","Monotonic Spline":"59.17225"},{"new_x":"14","Spline":"60","Monotonic Spline":"60"},{"new_x":"14.1","Spline":"61.4566685793938","Monotonic Spline":"61.204"},{"new_x":"14.2","Spline":"63.242810238979","Monotonic Spline":"62.952"},{"new_x":"14.3","Spline":"65.3218168587343","Monotonic Spline":"65.148"},{"new_x":"14.4","Spline":"67.6570803186386","Monotonic Spline":"67.696"},{"new_x":"14.5","Spline":"70.2119924986705","Monotonic Spline":"70.5"},{"new_x":"14.6","Spline":"72.9499452788088","Monotonic Spline":"73.464"},{"new_x":"14.7","Spline":"75.8343305390322","Monotonic Spline":"76.492"},{"new_x":"14.8","Spline":"78.8285401593193","Monotonic Spline":"79.488"},{"new_x":"14.9","Spline":"81.895966019649","Monotonic Spline":"82.356"},{"new_x":"15","Spline":"85","Monotonic Spline":"85"}]}

Here are the results graphed in EXCEL.

As in the previous example, we could specified a single point rather than a series of points for the new x-value.

SELECT wct.MONOSPLINE(x, y, 10) as [Monotonic Spline]

FROM

(

    VALUES

        (0, 10),

        (2, 10),

        (3, 10),

        (5, 10),

        (6, 10),

        (8, 10),

        (9, 10.5),

        (11, 15),

        (12, 50),

        (14, 60),

        (15, 85)

) n (x, y);

This produces the following result.

{"columns":[{"field":"Monotonic Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"Monotonic Spline":"11.1913223215136"}]}

In this example, we will interpolate using dates.

SELECT k.seriesvalue as new_x,

       wct.SPLINE(cast(cast(x as datetime) as float), y, CAST(k.SeriesValue as 

                 float)) as Spline,

       wct.MONOSPLINE(cast(cast(x as datetime) as float), y, CAST(k.SeriesValue 

                 as float)) as [Monotonic Spline]

FROM

(

    VALUES

        ('2013-08-19', .0020),

        ('2013-08-20', .0020),

        ('2013-08-21', .0020),

        ('2013-09-21', .0025),

        ('2013-10-21', -.0010),

        ('2013-11-21', .0015),

        ('2014-02-21', .0025),

        ('2014-05-21', .0035),

        ('2014-08-21', .0050),

        ('2015-08-21', .0112),

        ('2016-08-21', .0116)

) n (x, y)

    CROSS APPLY wct.SeriesDate('2013-08-19', '2016-08-19', 1, NULL, NULL) k

GROUP BY k.seriesvalue;

Here is the resultant table.

{"columns":[{"field":"new_x","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"Monotonic Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"new_x":"2013-08-19 00:00:00.000","Spline":"0.002","Monotonic Spline":"0.002"},{"new_x":"2013-08-20 00:00:00.000","Spline":"0.002","Monotonic Spline":"0.002"},{"new_x":"2013-08-21 00:00:00.000","Spline":"0.002","Monotonic Spline":"0.002"},{"new_x":"2013-08-22 00:00:00.000","Spline":"0.00200560082344269","Monotonic Spline":"0.00200309657279044"},{"new_x":"2013-08-23 00:00:00.000","Spline":"0.0020177952001447","Monotonic Spline":"0.00201204278697146"},{"new_x":"2013-08-24 00:00:00.000","Spline":"0.00203597364672621","Monotonic Spline":"0.00202632338625759"},{"new_x":"2013-08-25 00:00:00.000","Spline":"0.00205952667980739","Monotonic Spline":"0.0020454231143634"},{"new_x":"2013-08-26 00:00:00.000","Spline":"0.00208784481600843","Monotonic Spline":"0.00206882671500341"},{"new_x":"2013-08-27 00:00:00.000","Spline":"0.0021203185719495","Monotonic Spline":"0.00209601893189218"},{"new_x":"2013-08-28 00:00:00.000","Spline":"0.00215633846425077","Monotonic Spline":"0.00212648450874425"},{"new_x":"2013-08-29 00:00:00.000","Spline":"0.00219529500953241","Monotonic Spline":"0.00215970818927417"},{"new_x":"2013-08-30 00:00:00.000","Spline":"0.00223657872441462","Monotonic Spline":"0.00219517471719647"},{"new_x":"2013-08-31 00:00:00.000","Spline":"0.00227958012551755","Monotonic Spline":"0.00223236883622571"},{"new_x":"2013-09-01 00:00:00.000","Spline":"0.0023236897294614","Monotonic Spline":"0.00227077529007642"},{"new_x":"2013-09-02 00:00:00.000","Spline":"0.00236829805286632","Monotonic Spline":"0.00230987882246316"},{"new_x":"2013-09-03 00:00:00.000","Spline":"0.00241279561235251","Monotonic Spline":"0.00234916417710047"},{"new_x":"2013-09-04 00:00:00.000","Spline":"0.00245657292454013","Monotonic Spline":"0.00238811609770289"},{"new_x":"2013-09-05 00:00:00.000","Spline":"0.00249902050604937","Monotonic Spline":"0.00242621932798496"},{"new_x":"2013-09-06 00:00:00.000","Spline":"0.00253952887350039","Monotonic Spline":"0.00246295861166124"},{"new_x":"2013-09-07 00:00:00.000","Spline":"0.00257748854351338","Monotonic Spline":"0.00249781869244626"},{"new_x":"2013-09-08 00:00:00.000","Spline":"0.0026122900327085","Monotonic Spline":"0.00253028431405458"},{"new_x":"2013-09-09 00:00:00.000","Spline":"0.00264332385770595","Monotonic Spline":"0.00255984022020073"},{"new_x":"2013-09-10 00:00:00.000","Spline":"0.00266998053512588","Monotonic Spline":"0.00258597115459926"},{"new_x":"2013-09-11 00:00:00.000","Spline":"0.00269165058158848","Monotonic Spline":"0.00260816186096472"},{"new_x":"2013-09-12 00:00:00.000","Spline":"0.00270772451371393","Monotonic Spline":"0.00262589708301165"},{"new_x":"2013-09-13 00:00:00.000","Spline":"0.0027175928481224","Monotonic Spline":"0.00263866156445459"},{"new_x":"2013-09-14 00:00:00.000","Spline":"0.00272064610143406","Monotonic Spline":"0.00264594004900809"},{"new_x":"2013-09-15 00:00:00.000","Spline":"0.0027162747902691","Monotonic Spline":"0.00264721728038669"},{"new_x":"2013-09-16 00:00:00.000","Spline":"0.00270386943124769","Monotonic Spline":"0.00264197800230495"},{"new_x":"2013-09-17 00:00:00.000","Spline":"0.00268282054099","Monotonic Spline":"0.00262970695847739"},{"new_x":"2013-09-18 00:00:00.000","Spline":"0.00265251863611621","Monotonic Spline":"0.00260988889261858"},{"new_x":"2013-09-19 00:00:00.000","Spline":"0.00261235423324649","Monotonic Spline":"0.00258200854844304"},{"new_x":"2013-09-20 00:00:00.000","Spline":"0.00256171784900103","Monotonic Spline":"0.00254555066966534"},{"new_x":"2013-09-21 00:00:00.000","Spline":"0.0025","Monotonic Spline":"0.0025"},{"new_x":"2013-09-22 00:00:00.000","Spline":"0.00242683296042451","Monotonic Spline":"0.00244219952210275"},{"new_x":"2013-09-23 00:00:00.000","Spline":"0.00234281603469942","Monotonic Spline":"0.00237006929510155"},{"new_x":"2013-09-24 00:00:00.000","Spline":"0.00224879028481054","Monotonic Spline":"0.00228470967741936"},{"new_x":"2013-09-25 00:00:00.000","Spline":"0.00214559677274365","Monotonic Spline":"0.00218722102747909"},{"new_x":"2013-09-26 00:00:00.000","Spline":"0.00203407656048455","Monotonic Spline":"0.0020787037037037"},{"new_x":"2013-09-27 00:00:00.000","Spline":"0.00191507071001906","Monotonic Spline":"0.00196025806451613"},{"new_x":"2013-09-28 00:00:00.000","Spline":"0.00178942028333295","Monotonic Spline":"0.00183298446833931"},{"new_x":"2013-09-29 00:00:00.000","Spline":"0.00165796634241204","Monotonic Spline":"0.00169798327359618"},{"new_x":"2013-09-30 00:00:00.000","Spline":"0.00152154994924211","Monotonic Spline":"0.00155635483870968"},{"new_x":"2013-10-01 00:00:00.000","Spline":"0.00138101216580897","Monotonic Spline":"0.00140919952210275"},{"new_x":"2013-10-02 00:00:00.000","Spline":"0.00123719405409841","Monotonic Spline":"0.00125761768219833"},{"new_x":"2013-10-03 00:00:00.000","Spline":"0.00109093667609623","Monotonic Spline":"0.00110270967741935"},{"new_x":"2013-10-04 00:00:00.000","Spline":"0.000943081093788239","Monotonic Spline":"0.000945575866188769"},{"new_x":"2013-10-05 00:00:00.000","Spline":"0.000794468369160221","Monotonic Spline":"0.00078731660692951"},{"new_x":"2013-10-06 00:00:00.000","Spline":"0.000645939564197979","Monotonic Spline":"0.000629032258064516"},{"new_x":"2013-10-07 00:00:00.000","Spline":"0.00049833574088731","Monotonic Spline":"0.000471823178016726"},{"new_x":"2013-10-08 00:00:00.000","Spline":"0.000352497961214012","Monotonic Spline":"0.00031678972520908"},{"new_x":"2013-10-09 00:00:00.000","Spline":"0.000209267287163884","Monotonic Spline":"0.000165032258064516"},{"new_x":"2013-10-10 00:00:00.000","Spline":"6.94847807227233E-05","Monotonic Spline":"1.76511350059737E-05"},{"new_x":"2013-10-11 00:00:00.000","Spline":"-6.60084961236725E-05","Monotonic Spline":"-0.000124253285543608"},{"new_x":"2013-10-12 00:00:00.000","Spline":"-0.000196371481389505","Monotonic Spline":"-0.00025958064516129"},{"new_x":"2013-10-13 00:00:00.000","Spline":"-0.000320763113088976","Monotonic Spline":"-0.000387230585424134"},{"new_x":"2013-10-14 00:00:00.000","Spline":"-0.000438342329236289","Monotonic Spline":"-0.0005061027479092"},{"new_x":"2013-10-15 00:00:00.000","Spline":"-0.000548268067845644","Monotonic Spline":"-0.000615096774193548"},{"new_x":"2013-10-16 00:00:00.000","Spline":"-0.000649699266931245","Monotonic Spline":"-0.000713112305854241"},{"new_x":"2013-10-17 00:00:00.000","Spline":"-0.000741794864507293","Monotonic Spline":"-0.000799048984468339"},{"new_x":"2013-10-18 00:00:00.000","Spline":"-0.000823713798587991","Monotonic Spline":"-0.000871806451612903"},{"new_x":"2013-10-19 00:00:00.000","Spline":"-0.000894615007187539","Monotonic Spline":"-0.000930284348864994"},{"new_x":"2013-10-20 00:00:00.000","Spline":"-0.000953657428320142","Monotonic Spline":"-0.000973382317801673"},{"new_x":"2013-10-21 00:00:00.000","Spline":"-0.001","Monotonic Spline":"-0.001"},{"new_x":"2013-10-22 00:00:00.000","Spline":"-0.00103303499714847","Monotonic Spline":"-0.0010102204790502"},{"new_x":"2013-10-23 00:00:00.000","Spline":"-0.00105308804231552","Monotonic Spline":"-0.00100547478746444"},{"new_x":"2013-10-24 00:00:00.000","Spline":"-0.00106071809495826","Monotonic Spline":"-0.000986684490202728"},{"new_x":"2013-10-25 00:00:00.000","Spline":"-0.00105648411453383","Monotonic Spline":"-0.000954771152225042"},{"new_x":"2013-10-26 00:00:00.000","Spline":"-0.00104094506049934","Monotonic Spline":"-0.000910656338491378"},{"new_x":"2013-10-27 00:00:00.000","Spline":"-0.00101465989231191","Monotonic Spline":"-0.000855261613961727"},{"new_x":"2013-10-28 00:00:00.000","Spline":"-0.000978187569428663","Monotonic Spline":"-0.000789508543596081"},{"new_x":"2013-10-29 00:00:00.000","Spline":"-0.000932087051306721","Monotonic Spline":"-0.000714318692354431"},{"new_x":"2013-10-30 00:00:00.000","Spline":"-0.000876917297403203","Monotonic Spline":"-0.000630613625196769"},{"new_x":"2013-10-31 00:00:00.000","Spline":"-0.000813237267175232","Monotonic Spline":"-0.000539314907083087"},{"new_x":"2013-11-01 00:00:00.000","Spline":"-0.000741605920079927","Monotonic Spline":"-0.000441344102973375"},{"new_x":"2013-11-02 00:00:00.000","Spline":"-0.000662582215574409","Monotonic Spline":"-0.000337622777827626"},{"new_x":"2013-11-03 00:00:00.000","Spline":"-0.0005767251131158","Monotonic Spline":"-0.00022907249660583"},{"new_x":"2013-11-04 00:00:00.000","Spline":"-0.00048459357216122","Monotonic Spline":"-0.000116614824267981"},{"new_x":"2013-11-05 00:00:00.000","Spline":"-0.000386746552167791","Monotonic Spline":"-1.17132577406799E-06"},{"new_x":"2013-11-06 00:00:00.000","Spline":"-0.000283743012592632","Monotonic Spline":"0.000116336433915916"},{"new_x":"2013-11-07 00:00:00.000","Spline":"-0.000176141912892866","Monotonic Spline":"0.00023498688984198"},{"new_x":"2013-11-08 00:00:00.000","Spline":"-6.45022125256125E-05","Monotonic Spline":"0.000353858477044133"},{"new_x":"2013-11-09 00:00:00.000","Spline":"5.06171290520072E-05","Monotonic Spline":"0.000472029630562381"},{"new_x":"2013-11-10 00:00:00.000","Spline":"0.000168657152382872","Monotonic Spline":"0.000588578785436736"},{"new_x":"2013-11-11 00:00:00.000","Spline":"0.000289058898009861","Monotonic Spline":"0.000702584376707204"},{"new_x":"2013-11-12 00:00:00.000","Spline":"0.000411263406475854","Monotonic Spline":"0.000813124839413794"},{"new_x":"2013-11-13 00:00:00.000","Spline":"0.00053471171832373","Monotonic Spline":"0.000919278608596515"},{"new_x":"2013-11-14 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00:00:00.000","Spline":"0.0025","Monotonic Spline":"0.0025"},{"new_x":"2014-02-22 00:00:00.000","Spline":"0.00248435502908282","Monotonic Spline":"0.00250770831089285"},{"new_x":"2014-02-23 00:00:00.000","Spline":"0.0024697090545606","Monotonic Spline":"0.00251551975708819"},{"new_x":"2014-02-24 00:00:00.000","Spline":"0.00245604869483821","Monotonic Spline":"0.00252343354680769"},{"new_x":"2014-02-25 00:00:00.000","Spline":"0.00244336056832049","Monotonic Spline":"0.00253144888827302"},{"new_x":"2014-02-26 00:00:00.000","Spline":"0.0024316312934123","Monotonic Spline":"0.00253956498970586"},{"new_x":"2014-02-27 00:00:00.000","Spline":"0.00242084748851849","Monotonic Spline":"0.00254778105932789"},{"new_x":"2014-02-28 00:00:00.000","Spline":"0.00241099577204393","Monotonic Spline":"0.00255609630536076"},{"new_x":"2014-03-01 00:00:00.000","Spline":"0.00240206276239346","Monotonic Spline":"0.00256450993602616"},{"new_x":"2014-03-02 00:00:00.000","Spline":"0.00239403507797194","Monotonic 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00:00:00.000","Spline":"0.00354155600875729","Monotonic Spline":"0.00352774376972187"},{"new_x":"2014-05-24 00:00:00.000","Spline":"0.00356207245387571","Monotonic Spline":"0.0035417659226028"},{"new_x":"2014-05-25 00:00:00.000","Spline":"0.00358241789506408","Monotonic Spline":"0.00355588618117732"},{"new_x":"2014-05-26 00:00:00.000","Spline":"0.00360259485900501","Monotonic Spline":"0.00357010299070564"},{"new_x":"2014-05-27 00:00:00.000","Spline":"0.00362260587238107","Monotonic Spline":"0.00358441479644796"},{"new_x":"2014-05-28 00:00:00.000","Spline":"0.00364245346187486","Monotonic Spline":"0.00359882004366447"},{"new_x":"2014-05-29 00:00:00.000","Spline":"0.00366214015416896","Monotonic Spline":"0.00361331717761537"},{"new_x":"2014-05-30 00:00:00.000","Spline":"0.00368166847594596","Monotonic Spline":"0.00362790464356086"},{"new_x":"2014-05-31 00:00:00.000","Spline":"0.00370104095388844","Monotonic Spline":"0.00364258088676113"},{"new_x":"2014-06-01 00:00:00.000","Spline":"0.00372026011467901","Monotonic Spline":"0.0036573443524764"},{"new_x":"2014-06-02 00:00:00.000","Spline":"0.00373932848500023","Monotonic Spline":"0.00367219348596685"},{"new_x":"2014-06-03 00:00:00.000","Spline":"0.0037582485915347","Monotonic Spline":"0.00368712673249268"},{"new_x":"2014-06-04 00:00:00.000","Spline":"0.00377702296096501","Monotonic Spline":"0.0037021425373141"},{"new_x":"2014-06-05 00:00:00.000","Spline":"0.00379565411997375","Monotonic Spline":"0.0037172393456913"},{"new_x":"2014-06-06 00:00:00.000","Spline":"0.0038141445952435","Monotonic Spline":"0.00373241560288448"},{"new_x":"2014-06-07 00:00:00.000","Spline":"0.00383249691345685","Monotonic Spline":"0.00374766975415385"},{"new_x":"2014-06-08 00:00:00.000","Spline":"0.00385071360129639","Monotonic Spline":"0.00376300024475958"},{"new_x":"2014-06-09 00:00:00.000","Spline":"0.0038687971854447","Monotonic Spline":"0.0037784055199619"},{"new_x":"2014-06-10 00:00:00.000","Spline":"0.00388675019258438","Monotonic Spline":"0.00379388402502099"},{"new_x":"2014-06-11 00:00:00.000","Spline":"0.003904575149398","Monotonic Spline":"0.00380943420519705"},{"new_x":"2014-06-12 00:00:00.000","Spline":"0.00392227458256817","Monotonic Spline":"0.00382505450575029"},{"new_x":"2014-06-13 00:00:00.000","Spline":"0.00393985101877746","Monotonic Spline":"0.0038407433719409"},{"new_x":"2014-06-14 00:00:00.000","Spline":"0.00395730698470846","Monotonic Spline":"0.00385649924902907"},{"new_x":"2014-06-15 00:00:00.000","Spline":"0.00397464500704376","Monotonic Spline":"0.00387232058227502"},{"new_x":"2014-06-16 00:00:00.000","Spline":"0.00399186761246596","Monotonic Spline":"0.00388820581693893"},{"new_x":"2014-06-17 00:00:00.000","Spline":"0.00400897732765763","Monotonic Spline":"0.00390415339828101"},{"new_x":"2014-06-18 00:00:00.000","Spline":"0.00402597667930136","Monotonic Spline":"0.00392016177156146"},{"new_x":"2014-06-19 00:00:00.000","Spline":"0.00404286819407974","Monotonic Spline":"0.00393622938204047"},{"new_x":"2014-06-20 00:00:00.000","Spline":"0.00405965439867537","Monotonic Spline":"0.00395235467497824"},{"new_x":"2014-06-21 00:00:00.000","Spline":"0.00407633781977081","Monotonic Spline":"0.00396853609563497"},{"new_x":"2014-06-22 00:00:00.000","Spline":"0.00409292098404868","Monotonic Spline":"0.00398477208927086"},{"new_x":"2014-06-23 00:00:00.000","Spline":"0.00410940641819154","Monotonic Spline":"0.00400106110114611"},{"new_x":"2014-06-24 00:00:00.000","Spline":"0.004125796648882","Monotonic Spline":"0.00401740157652091"},{"new_x":"2014-06-25 00:00:00.000","Spline":"0.00414209420280263","Monotonic Spline":"0.00403379196065547"},{"new_x":"2014-06-26 00:00:00.000","Spline":"0.00415830160663602","Monotonic Spline":"0.00405023069880999"},{"new_x":"2014-06-27 00:00:00.000","Spline":"0.00417442138706477","Monotonic Spline":"0.00406671623624466"},{"new_x":"2014-06-28 00:00:00.000","Spline":"0.00419045607077145","Monotonic Spline":"0.00408324701821967"},{"new_x":"2014-06-29 00:00:00.000","Spline":"0.00420640818443867","Monotonic Spline":"0.00409982148999524"},{"new_x":"2014-06-30 00:00:00.000","Spline":"0.00422228025474899","Monotonic Spline":"0.00411643809683156"},{"new_x":"2014-07-01 00:00:00.000","Spline":"0.00423807480838502","Monotonic Spline":"0.00413309528398883"},{"new_x":"2014-07-02 00:00:00.000","Spline":"0.00425379437202934","Monotonic Spline":"0.00414979149672724"},{"new_x":"2014-07-03 00:00:00.000","Spline":"0.00426944147236454","Monotonic Spline":"0.00416652518030699"},{"new_x":"2014-07-04 00:00:00.000","Spline":"0.0042850186360732","Monotonic Spline":"0.0041832947799883"},{"new_x":"2014-07-05 00:00:00.000","Spline":"0.00430052838983791","Monotonic Spline":"0.00420009874103134"},{"new_x":"2014-07-06 00:00:00.000","Spline":"0.00431597326034126","Monotonic Spline":"0.00421693550869632"},{"new_x":"2014-07-07 00:00:00.000","Spline":"0.00433135577426585","Monotonic Spline":"0.00423380352824345"},{"new_x":"2014-07-08 00:00:00.000","Spline":"0.00434667845829424","Monotonic Spline":"0.00425070124493291"},{"new_x":"2014-07-09 00:00:00.000","Spline":"0.00436194383910904","Monotonic Spline":"0.0042676271040249"},{"new_x":"2014-07-10 00:00:00.000","Spline":"0.00437715444339283","Monotonic Spline":"0.00428457955077964"},{"new_x":"2014-07-11 00:00:00.000","Spline":"0.0043923127978282","Monotonic Spline":"0.00430155703045731"},{"new_x":"2014-07-12 00:00:00.000","Spline":"0.00440742142909773","Monotonic Spline":"0.00431855798831811"},{"new_x":"2014-07-13 00:00:00.000","Spline":"0.00442248286388401","Monotonic Spline":"0.00433558086962224"},{"new_x":"2014-07-14 00:00:00.000","Spline":"0.00443749962886964","Monotonic Spline":"0.0043526241196299"},{"new_x":"2014-07-15 00:00:00.000","Spline":"0.00445247425073719","Monotonic Spline":"0.00436968618360129"},{"new_x":"2014-07-16 00:00:00.000","Spline":"0.00446740925616926","Monotonic Spline":"0.00438676550679661"},{"new_x":"2014-07-17 00:00:00.000","Spline":"0.00448230717184843","Monotonic Spline":"0.00440386053447606"},{"new_x":"2014-07-18 00:00:00.000","Spline":"0.0044971705244573","Monotonic Spline":"0.00442096971189983"},{"new_x":"2014-07-19 00:00:00.000","Spline":"0.00451200184067844","Monotonic Spline":"0.00443809148432813"},{"new_x":"2014-07-20 00:00:00.000","Spline":"0.00452680364719445","Monotonic Spline":"0.00445522429702114"},{"new_x":"2014-07-21 00:00:00.000","Spline":"0.00454157847068791","Monotonic Spline":"0.00447236659523908"},{"new_x":"2014-07-22 00:00:00.000","Spline":"0.00455632883784141","Monotonic Spline":"0.00448951682424214"},{"new_x":"2014-07-23 00:00:00.000","Spline":"0.00457105727533754","Monotonic Spline":"0.00450667342929052"},{"new_x":"2014-07-24 00:00:00.000","Spline":"0.00458576630985889","Monotonic Spline":"0.00452383485564441"},{"new_x":"2014-07-25 00:00:00.000","Spline":"0.00460045846808804","Monotonic Spline":"0.00454099954856402"},{"new_x":"2014-07-26 00:00:00.000","Spline":"0.00461513627670759","Monotonic Spline":"0.00455816595330954"},{"new_x":"2014-07-27 00:00:00.000","Spline":"0.00462980226240011","Monotonic Spline":"0.00457533251514118"},{"new_x":"2014-07-28 00:00:00.000","Spline":"0.0046444589518482","Monotonic Spline":"0.00459249767931913"},{"new_x":"2014-07-29 00:00:00.000","Spline":"0.00465910887173444","Monotonic Spline":"0.00460965989110359"},{"new_x":"2014-07-30 00:00:00.000","Spline":"0.00467375454874143","Monotonic Spline":"0.00462681759575476"},{"new_x":"2014-07-31 00:00:00.000","Spline":"0.00468839850955174","Monotonic Spline":"0.00464396923853283"},{"new_x":"2014-08-01 00:00:00.000","Spline":"0.00470304328084797","Monotonic Spline":"0.00466111326469801"},{"new_x":"2014-08-02 00:00:00.000","Spline":"0.00471769138931271","Monotonic Spline":"0.0046782481195105"},{"new_x":"2014-08-03 00:00:00.000","Spline":"0.00473234536162853","Monotonic Spline":"0.00469537224823049"},{"new_x":"2014-08-04 00:00:00.000","Spline":"0.00474700772447804","Monotonic Spline":"0.00471248409611819"},{"new_x":"2014-08-05 00:00:00.000","Spline":"0.00476168100454381","Monotonic Spline":"0.00472958210843378"},{"new_x":"2014-08-06 00:00:00.000","Spline":"0.00477636772850844","Monotonic Spline":"0.00474666473043748"},{"new_x":"2014-08-07 00:00:00.000","Spline":"0.00479107042305451","Monotonic Spline":"0.00476373040738947"},{"new_x":"2014-08-08 00:00:00.000","Spline":"0.00480579161486462","Monotonic Spline":"0.00478077758454996"},{"new_x":"2014-08-09 00:00:00.000","Spline":"0.00482053383062133","Monotonic Spline":"0.00479780470717915"},{"new_x":"2014-08-10 00:00:00.000","Spline":"0.00483529959700726","Monotonic Spline":"0.00481481022053723"},{"new_x":"2014-08-11 00:00:00.000","Spline":"0.00485009144070497","Monotonic Spline":"0.00483179256988441"},{"new_x":"2014-08-12 00:00:00.000","Spline":"0.00486491188839707","Monotonic Spline":"0.00484875020048088"},{"new_x":"2014-08-13 00:00:00.000","Spline":"0.00487976346676613","Monotonic Spline":"0.00486568155758683"},{"new_x":"2014-08-14 00:00:00.000","Spline":"0.00489464870249476","Monotonic Spline":"0.00488258508646248"},{"new_x":"2014-08-15 00:00:00.000","Spline":"0.00490957012226552","Monotonic Spline":"0.00489945923236802"},{"new_x":"2014-08-16 00:00:00.000","Spline":"0.00492453025276101","Monotonic Spline":"0.00491630244056364"},{"new_x":"2014-08-17 00:00:00.000","Spline":"0.00493953162066382","Monotonic Spline":"0.00493311315630954"},{"new_x":"2014-08-18 00:00:00.000","Spline":"0.00495457675265654","Monotonic Spline":"0.00494988982486593"},{"new_x":"2014-08-19 00:00:00.000","Spline":"0.00496966817542175","Monotonic Spline":"0.00496663089149301"},{"new_x":"2014-08-20 00:00:00.000","Spline":"0.00498480841564204","Monotonic Spline":"0.00498333480145096"},{"new_x":"2014-08-21 00:00:00.000","Spline":"0.005","Monotonic Spline":"0.005"},{"new_x":"2014-08-22 00:00:00.000","Spline":"0.00501524497354111","Monotonic Spline":"0.00501668470737878"},{"new_x":"2014-08-23 00:00:00.000","Spline":"0.00503054345476244","Monotonic Spline":"0.00503344775780709"},{"new_x":"2014-08-24 00:00:00.000","Spline":"0.00504589508052394","Monotonic Spline":"0.00505028851751685"},{"new_x":"2014-08-25 00:00:00.000","Spline":"0.00506129948768557","Monotonic Spline":"0.00506720635273996"},{"new_x":"2014-08-26 00:00:00.000","Spline":"0.0050767563131073","Monotonic Spline":"0.00508420062970832"},{"new_x":"2014-08-27 00:00:00.000","Spline":"0.00509226519364909","Monotonic Spline":"0.00510127071465383"},{"new_x":"2014-08-28 00:00:00.000","Spline":"0.00510782576617088","Monotonic Spline":"0.0051184159738084"},{"new_x":"2014-08-29 00:00:00.000","Spline":"0.00512343766753265","Monotonic Spline":"0.00513563577340392"},{"new_x":"2014-08-30 00:00:00.000","Spline":"0.00513910053459436","Monotonic 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00:00:00.000","Spline":"0.0119074490928267","Monotonic Spline":"0.0115735159587945"},{"new_x":"2016-05-24 00:00:00.000","Spline":"0.0119046037459468","Monotonic Spline":"0.0115737985579459"},{"new_x":"2016-05-25 00:00:00.000","Spline":"0.0119017392676429","Monotonic Spline":"0.0115740794974778"},{"new_x":"2016-05-26 00:00:00.000","Spline":"0.0118988558728747","Monotonic Spline":"0.0115743588429068"},{"new_x":"2016-05-27 00:00:00.000","Spline":"0.011895953776602","Monotonic Spline":"0.0115746366597497"},{"new_x":"2016-05-28 00:00:00.000","Spline":"0.0118930331937848","Monotonic Spline":"0.011574913013523"},{"new_x":"2016-05-29 00:00:00.000","Spline":"0.0118900943393827","Monotonic Spline":"0.0115751879697434"},{"new_x":"2016-05-30 00:00:00.000","Spline":"0.0118871374283557","Monotonic Spline":"0.0115754615939275"},{"new_x":"2016-05-31 00:00:00.000","Spline":"0.0118841626756635","Monotonic Spline":"0.0115757339515919"},{"new_x":"2016-06-01 00:00:00.000","Spline":"0.011881170296266","Monotonic Spline":"0.0115760051082532"},{"new_x":"2016-06-02 00:00:00.000","Spline":"0.011878160505123","Monotonic Spline":"0.0115762751294281"},{"new_x":"2016-06-03 00:00:00.000","Spline":"0.0118751335171944","Monotonic Spline":"0.0115765440806332"},{"new_x":"2016-06-04 00:00:00.000","Spline":"0.0118720895474398","Monotonic Spline":"0.0115768120273851"},{"new_x":"2016-06-05 00:00:00.000","Spline":"0.0118690288108192","Monotonic Spline":"0.0115770790352005"},{"new_x":"2016-06-06 00:00:00.000","Spline":"0.0118659515222924","Monotonic Spline":"0.011577345169596"},{"new_x":"2016-06-07 00:00:00.000","Spline":"0.0118628578968192","Monotonic Spline":"0.0115776104960882"},{"new_x":"2016-06-08 00:00:00.000","Spline":"0.0118597481493595","Monotonic Spline":"0.0115778750801938"},{"new_x":"2016-06-09 00:00:00.000","Spline":"0.0118566224948729","Monotonic Spline":"0.0115781389874293"},{"new_x":"2016-06-10 00:00:00.000","Spline":"0.0118534811483195","Monotonic Spline":"0.0115784022833114"},{"new_x":"2016-06-11 00:00:00.000","Spline":"0.0118503243246589","Monotonic Spline":"0.0115786650333567"},{"new_x":"2016-06-12 00:00:00.000","Spline":"0.011847152238851","Monotonic Spline":"0.0115789273030819"},{"new_x":"2016-06-13 00:00:00.000","Spline":"0.0118439651058556","Monotonic Spline":"0.0115791891580036"},{"new_x":"2016-06-14 00:00:00.000","Spline":"0.0118407631406326","Monotonic Spline":"0.0115794506636384"},{"new_x":"2016-06-15 00:00:00.000","Spline":"0.0118375465581418","Monotonic Spline":"0.011579711885503"},{"new_x":"2016-06-16 00:00:00.000","Spline":"0.0118343155733429","Monotonic Spline":"0.0115799728891139"},{"new_x":"2016-06-17 00:00:00.000","Spline":"0.0118310704011959","Monotonic Spline":"0.0115802337399878"},{"new_x":"2016-06-18 00:00:00.000","Spline":"0.0118278112566605","Monotonic Spline":"0.0115804945036413"},{"new_x":"2016-06-19 00:00:00.000","Spline":"0.0118245383546965","Monotonic Spline":"0.0115807552455911"},{"new_x":"2016-06-20 00:00:00.000","Spline":"0.0118212519102638","Monotonic Spline":"0.0115810160313538"},{"new_x":"2016-06-21 00:00:00.000","Spline":"0.0118179521383223","Monotonic Spline":"0.011581276926446"},{"new_x":"2016-06-22 00:00:00.000","Spline":"0.0118146392538316","Monotonic Spline":"0.0115815379963843"},{"new_x":"2016-06-23 00:00:00.000","Spline":"0.0118113134717517","Monotonic Spline":"0.0115817993066854"},{"new_x":"2016-06-24 00:00:00.000","Spline":"0.0118079750070423","Monotonic Spline":"0.0115820609228659"},{"new_x":"2016-06-25 00:00:00.000","Spline":"0.0118046240746633","Monotonic Spline":"0.0115823229104424"},{"new_x":"2016-06-26 00:00:00.000","Spline":"0.0118012608895745","Monotonic Spline":"0.0115825853349316"},{"new_x":"2016-06-27 00:00:00.000","Spline":"0.0117978856667357","Monotonic Spline":"0.0115828482618501"},{"new_x":"2016-06-28 00:00:00.000","Spline":"0.0117944986211068","Monotonic Spline":"0.0115831117567144"},{"new_x":"2016-06-29 00:00:00.000","Spline":"0.0117910999676475","Monotonic Spline":"0.0115833758850413"},{"new_x":"2016-06-30 00:00:00.000","Spline":"0.0117876899213177","Monotonic Spline":"0.0115836407123474"},{"new_x":"2016-07-01 00:00:00.000","Spline":"0.0117842686970773","Monotonic Spline":"0.0115839063041492"},{"new_x":"2016-07-02 00:00:00.000","Spline":"0.0117808365098859","Monotonic Spline":"0.0115841727259635"},{"new_x":"2016-07-03 00:00:00.000","Spline":"0.0117773935747035","Monotonic Spline":"0.0115844400433068"},{"new_x":"2016-07-04 00:00:00.000","Spline":"0.0117739401064899","Monotonic Spline":"0.0115847083216958"},{"new_x":"2016-07-05 00:00:00.000","Spline":"0.0117704763202048","Monotonic Spline":"0.0115849776266471"},{"new_x":"2016-07-06 00:00:00.000","Spline":"0.0117670024308082","Monotonic Spline":"0.0115852480236774"},{"new_x":"2016-07-07 00:00:00.000","Spline":"0.0117635186532598","Monotonic Spline":"0.0115855195783032"},{"new_x":"2016-07-08 00:00:00.000","Spline":"0.0117600252025195","Monotonic Spline":"0.0115857923560412"},{"new_x":"2016-07-09 00:00:00.000","Spline":"0.011756522293547","Monotonic Spline":"0.011586066422408"},{"new_x":"2016-07-10 00:00:00.000","Spline":"0.0117530101413022","Monotonic Spline":"0.0115863418429203"},{"new_x":"2016-07-11 00:00:00.000","Spline":"0.0117494889607449","Monotonic Spline":"0.0115866186830947"},{"new_x":"2016-07-12 00:00:00.000","Spline":"0.011745958966835","Monotonic Spline":"0.0115868970084477"},{"new_x":"2016-07-13 00:00:00.000","Spline":"0.0117424203745322","Monotonic Spline":"0.0115871768844961"},{"new_x":"2016-07-14 00:00:00.000","Spline":"0.0117388733987965","Monotonic Spline":"0.0115874583767564"},{"new_x":"2016-07-15 00:00:00.000","Spline":"0.0117353182545875","Monotonic Spline":"0.0115877415507454"},{"new_x":"2016-07-16 00:00:00.000","Spline":"0.0117317551568651","Monotonic Spline":"0.0115880264719795"},{"new_x":"2016-07-17 00:00:00.000","Spline":"0.0117281843205892","Monotonic Spline":"0.0115883132059755"},{"new_x":"2016-07-18 00:00:00.000","Spline":"0.0117246059607195","Monotonic Spline":"0.01158860181825"},{"new_x":"2016-07-19 00:00:00.000","Spline":"0.0117210202922159","Monotonic Spline":"0.0115888923743196"},{"new_x":"2016-07-20 00:00:00.000","Spline":"0.0117174275300383","Monotonic Spline":"0.0115891849397009"},{"new_x":"2016-07-21 00:00:00.000","Spline":"0.0117138278891463","Monotonic Spline":"0.0115894795799106"},{"new_x":"2016-07-22 00:00:00.000","Spline":"0.0117102215844999","Monotonic Spline":"0.0115897763604652"},{"new_x":"2016-07-23 00:00:00.000","Spline":"0.0117066088310589","Monotonic Spline":"0.0115900753468815"},{"new_x":"2016-07-24 00:00:00.000","Spline":"0.0117029898437831","Monotonic Spline":"0.011590376604676"},{"new_x":"2016-07-25 00:00:00.000","Spline":"0.0116993648376322","Monotonic Spline":"0.0115906801993654"},{"new_x":"2016-07-26 00:00:00.000","Spline":"0.0116957340275662","Monotonic Spline":"0.0115909861964663"},{"new_x":"2016-07-27 00:00:00.000","Spline":"0.0116920976285449","Monotonic Spline":"0.0115912946614953"},{"new_x":"2016-07-28 00:00:00.000","Spline":"0.011688455855528","Monotonic Spline":"0.011591605659969"},{"new_x":"2016-07-29 00:00:00.000","Spline":"0.0116848089234754","Monotonic Spline":"0.0115919192574042"},{"new_x":"2016-07-30 00:00:00.000","Spline":"0.011681157047347","Monotonic Spline":"0.0115922355193174"},{"new_x":"2016-07-31 00:00:00.000","Spline":"0.0116775004421025","Monotonic Spline":"0.0115925545112252"},{"new_x":"2016-08-01 00:00:00.000","Spline":"0.0116738393227017","Monotonic Spline":"0.0115928762986443"},{"new_x":"2016-08-02 00:00:00.000","Spline":"0.0116701739041045","Monotonic Spline":"0.0115932009470912"},{"new_x":"2016-08-03 00:00:00.000","Spline":"0.0116665044012707","Monotonic Spline":"0.0115935285220827"},{"new_x":"2016-08-04 00:00:00.000","Spline":"0.0116628310291602","Monotonic Spline":"0.0115938590891354"},{"new_x":"2016-08-05 00:00:00.000","Spline":"0.0116591540027326","Monotonic Spline":"0.0115941927137658"},{"new_x":"2016-08-06 00:00:00.000","Spline":"0.011655473536948","Monotonic Spline":"0.0115945294614907"},{"new_x":"2016-08-07 00:00:00.000","Spline":"0.011651789846766","Monotonic Spline":"0.0115948693978266"},{"new_x":"2016-08-08 00:00:00.000","Spline":"0.0116481031471465","Monotonic Spline":"0.0115952125882901"},{"new_x":"2016-08-09 00:00:00.000","Spline":"0.0116444136530494","Monotonic Spline":"0.011595559098398"},{"new_x":"2016-08-10 00:00:00.000","Spline":"0.0116407215794344","Monotonic Spline":"0.0115959089936668"},{"new_x":"2016-08-11 00:00:00.000","Spline":"0.0116370271412614","Monotonic Spline":"0.0115962623396131"},{"new_x":"2016-08-12 00:00:00.000","Spline":"0.0116333305534901","Monotonic Spline":"0.0115966192017536"},{"new_x":"2016-08-13 00:00:00.000","Spline":"0.0116296320310805","Monotonic Spline":"0.0115969796456049"},{"new_x":"2016-08-14 00:00:00.000","Spline":"0.0116259317889923","Monotonic Spline":"0.0115973437366837"},{"new_x":"2016-08-15 00:00:00.000","Spline":"0.0116222300421854","Monotonic Spline":"0.0115977115405065"},{"new_x":"2016-08-16 00:00:00.000","Spline":"0.0116185270056195","Monotonic Spline":"0.01159808312259"},{"new_x":"2016-08-17 00:00:00.000","Spline":"0.0116148228942545","Monotonic Spline":"0.0115984585484509"},{"new_x":"2016-08-18 00:00:00.000","Spline":"0.0116111179230503","Monotonic Spline":"0.0115988378836056"},{"new_x":"2016-08-19 00:00:00.000","Spline":"0.0116074123069665","Monotonic Spline":"0.011599221193571"}]}

Here is a graph of the result in EXCEL.

Of course, we could specify a single point rather than a series of points.

SELECT wct.MONOSPLINE(cast(cast(x as datetime) as float), y, westclintech.wct.DATEFLOAT(

          2014, 07, 21)) as [Monotonic Spline]

FROM

(

    VALUES

        ('2013-08-19', .0020),

        ('2013-08-20', .0020),

        ('2013-08-21', .0020),

        ('2013-09-21', .0025),

        ('2013-10-21', -.0010),

        ('2013-11-21', .0015),

        ('2014-02-21', .0025),

        ('2014-05-21', .0035),

        ('2014-08-21', .0050),

        ('2015-08-21', .0112),

        ('2016-08-21', .0116)

) n (x, y);

This produces the following result.

{"columns":[{"field":"Monotonic Spline","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"Monotonic Spline":"0.00447236659523908"}]}