KSPSetComputeInitialGuess#

set routine to compute the initial guess of the linear system

Synopsis#

#include "petscksp.h" 
#include "petscmat.h" 
PetscErrorCode KSPSetComputeInitialGuess(KSP ksp, PetscErrorCode (*func)(KSP, Vec, void *), void *ctx)

Logically Collective

Input Parameters#

  • ksp - the KSP context

  • func - function to compute the initial guess

  • ctx - optional context

Calling sequence of func#

func(KSP ksp,Vec x,void *ctx)
  • ksp - the KSP context

  • x - solution vector

  • ctx - optional user-provided context

Notes: This should only be used in conjunction with KSPSetComputeRHS(), KSPSetComputeOperators(), otherwise call KSPSetInitialGuessNonzero() and set the initial guess values in the solution vector passed to KSPSolve().

See Also#

KSPSolve(), KSPSetComputeRHS(), KSPSetComputeOperators(), DMKSPSetComputeInitialGuess()

Level#

beginner

Location#

src/ksp/ksp/interface/itfunc.c

Examples#

src/ksp/ksp/tutorials/ex45.c.html
src/ksp/ksp/tutorials/ex45f.F90.html


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