[petsc-users] PCDiagonalScale
Klaij, Christiaan
C.Klaij at marin.nl
Wed Feb 23 09:45:39 CST 2011
I'm trying to understand the use of PCDiagonalScale since I want to apply additional diagonal scaling when solving my linear system.
As a first step I modified src/ksp/ksp/examples/tutorials/ex2f.F in petsc-3.1-p7 as follows:
1) at line 87 added 3 lines:
PC pc
PCType ptype
PetscScalar tol
2) then I uncommented lines 247 -- 252 (the ones to use PCJACOBI)
3) at line 253 I added :
call PCDiagonalScale(pc,PETSC_TRUE,ierr)
Running "make ex2f" gives:
ex2f.o: In function `MAIN__':
ex2f.F:(.text+0x767): undefined reference to `pcdiagonalscale_'
Without the call to PCDiagonalScale "make ex2f" does not give any errors and runs fine...
dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
E mailto:C.Klaij at marin.nl
T +31 317 49 33 44
MARIN
2, Haagsteeg, P.O. Box 28, 6700 AA Wageningen, The Netherlands
T +31 317 49 39 11, F +31 317 49 32 45, I www.marin.nl
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