PCShellSetPreSolve#
Sets routine to apply to the operators/vectors before a KSPSolve() is applied. This usually does something like scale the linear system in some application specific way.
Synopsis#
#include "petscpc.h"
PetscErrorCode PCShellSetPreSolve(PC pc, PetscErrorCode (*presolve)(PC, KSP, Vec, Vec))
Logically Collective
Input Parameters#
pc - the preconditioner context
presolve - the application-provided presolve routine
Calling sequence of presolve#
PetscErrorCode presolve(PC pc, KSP ksp, Vec b, Vec x)
pc - the preconditioner, get the application context with
PCShellGetContext()xin - input vector
xout - output vector
See Also#
PCSHELL, PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose(), PCShellSetPostSolve(), PCShellSetContext()
Level#
advanced
Location#
Implementations#
PCShellSetPreSolve_Shell(PC pc, PetscErrorCode (*presolve) in src/ksp/pc/impls/shell/shellpc.c
Index of all PC routines
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Index of all manual pages