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 pc, KSP ksp, Vec xin, Vec xout))

Logically Collective

Input Parameters

• pc - the preconditioner context

• presolve - the application-provided presolve routine

Calling sequence of presolve

• pc - the preconditioner

• ksp - the KSP that contains pc

• xin - input vector

• xout - output vector

Note

You can get the PCSHELL context set with PCShellSetContext() using PCShellGetContext() if needed by presolve.

See Also

KSP: Linear System Solvers, PCSHELL, PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose(), PCShellSetPostSolve(), PCShellSetContext(), PCGetContext()

Level

advanced

Location

src/ksp/pc/impls/shell/shellpc.c

Implementations

PCShellSetPreSolve_Shell(PC pc, PetscErrorCode (*presolve)() in src/ksp/pc/impls/shell/shellpc.c

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