source: palm/trunk/UTIL/chemistry/gasphase_preproc/kpp/util/dFun_dRcoeff.f90 @ 3961

Last change on this file since 3961 was 2696, checked in by kanani, 7 years ago

Merge of branch palm4u into trunk

File size: 1.9 KB
Line 
1! ------------------------------------------------------------------------------
2! Subroutine for the derivative of Fun with respect to rate coefficients
3! -----------------------------------------------------------------------------
4
5      SUBROUTINE  dFun_dRcoeff( V, F, NCOEFF, JCOEFF, DFDR )
6       
7      USE KPP_ROOT_Parameters
8      USE KPP_ROOT_StoichiomSP
9      IMPLICIT NONE 
10
11! V - Concentrations of variable/radical/fixed species           
12      KPP_REAL V(NVAR), F(NFIX)
13! NCOEFF - the number of rate coefficients with respect to which we differentiate
14      INTEGER NCOEFF       
15! JCOEFF - a vector of integers containing the indices of reactions (rate
16!          coefficients) with respect to which we differentiate
17      INTEGER JCOEFF(NCOEFF)       
18! DFDR  - a matrix containg derivative values; specifically,
19!         column j contains d Fun(1:NVAR) / d RCT( JCOEFF(j) )
20!         for each 1 <= j <= NCOEFF
21!         This matrix is stored in a column-wise linearized format
22      KPP_REAL DFDR(NVAR*NCOEFF)
23
24! Local vector with reactant products
25      KPP_REAL A_RPROD(NREACT)
26      KPP_REAL aj
27      INTEGER i,j,k
28     
29! Compute the reactant products of all reactions     
30      CALL ReactantProd ( V, F, A_RPROD )
31
32! Compute the derivatives by multiplying column JCOEFF(j) of the stoichiometric matrix with A_RPROD       
33      DO j=1,NCOEFF
34!                  Initialize the j-th column of derivative matrix to zero       
35         DO i=1,NVAR
36           DFDR(i+NVAR*(j-1)) = 0.0_dp 
37         END DO
38!                  Column JCOEFF(j) in the stoichiometric matrix times the
39!                  reactant product  of the JCOEFF(j)-th reaction     
40!                  give the j-th column of the derivative matrix   
41         aj = A_RPROD(JCOEFF(j))
42         DO k=CCOL_STOICM(JCOEFF(j)),CCOL_STOICM(JCOEFF(j)+1)-1
43           DFDR(IROW_STOICM(k)+NVAR*(j-1)) = STOICM(k)*aj
44         END DO
45      END DO
46     
47      END SUBROUTINE  dFun_dRcoeff
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