!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
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***S/P DVRTEF
*
SUBROUTINE DVRTEF ( R , X , N , MR , MX , NK ,W )
*
#include "impnone.cdk"
INTEGER N,MR,MX,NK
REAL R(MR,NK),X(MX,NK),W(N,2)
*
*Author
* J. Cote (RPN 1983)
*
*Revision
* 001 J. Cote RPN(Nov 1984)SEF version documentation
* 002 M. Lepine - RFE model code revision project (Jan87)
* - pass the workfield W in an argument
*
*Object
* to calculate the vertical derivative in finite_element space
*
*Arguments
*
* - Output -
* R result
*
* - Input -
* X variable to derive
* N horizontal dimension
* MR 1st dimension of R
* MX 1st dimension of X
* NK vertical dimension
* W work space
*
*Notes
* R and X can share the same space.
*
**
*
INTEGER J,K,JO,JP,JJ
*
JO=1
JP=2
*
DO 10 J=1,N
W(J,JO)=X(J,1)
R(J,1)=0.5*(X(J,2)-X(J,1))
10 CONTINUE
*
DO 30 K=2,NK-1
CDIR$ IVDEP
DO 20 J=1,N
W(J,JP)=X(J,K)
R(J,K)=0.5*(X(J,K+1)-W(J,JO))
20 CONTINUE
*
JJ=JP
JP=JO
JO=JJ
30 CONTINUE
*
DO 40 J=1,N
R(J,NK)=0.5*(X(J,NK)-W(J,JO))
40 CONTINUE
*
RETURN
END