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*DECK DETSPL2
SUBROUTINE DETSPL2(XCNTR ,YCNTR ,NXMAX ,NYMAX ,FXY,
> FP1 ,FP2 ,F2X ,F2Y ,FDUMMY,
> XINT ,YINT ,FYINT ,FXYINT)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Perform spline interpolation.
*
*Copyright:
* Copyright (C) 2010 Ecole Polytechnique de Montreal.
*
*Author(s):
* E. Varin
*
*Parameters:
* XCNTR
* YCNTR
* NXMAX
* NYMAX
* FXY
* FP1
* FP2
* F2X
* F2Y
* FDUMMY
* XINT
* YINT
* FYINT
* FXYINT
*
*-----------------------------------------------------------------------
*
REAL*4 XCNTR(NXMAX),YCNTR(NYMAX),FXY(NXMAX,NYMAX),
> XINT ,YINT ,FXYINT,
> F2X(NXMAX) ,F2Y(NYMAX) ,FYINT(NYMAX),
> FDUMMY(NXMAX)
*----
* CALCULATE THE SECOND DERIVATIVES ALONG XCNTR FOR EACH Y
*----
DO 10 I=1,NYMAX
DO 20 J=1,NXMAX
FDUMMY(J) = FXY(J,I)
20 CONTINUE
CALL DETSPLI(XCNTR,FDUMMY,NXMAX,FP1,FP2,F2X)
*----
* INTERPOLATE ALONG THE X COORDINATE FOR EACH Y
*----
CALL DETSPLI2(XCNTR,FDUMMY,F2X,NXMAX,XINT,FYINT(I))
10 CONTINUE
*----
* CALCULATE SECOND DERIVATIVE ALONG Y FOR XINT
*----
CALL DETSPLI(YCNTR,FYINT,NYMAX,FP1,FP2,F2Y)
*----
* INTERPOLATE ALONG Y FOR XINT
*----
CALL DETSPLI2(YCNTR,FYINT,F2Y,NYMAX,YINT,FXYINT)
RETURN
END
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