MFNSetTolerances#

Sets the tolerance and maximum iteration count used by the MFN convergence tests.

Synopsis#

#include "slepcmfn.h" 
PetscErrorCode MFNSetTolerances(MFN mfn,PetscReal tol,PetscInt maxits)

Logically Collective

Input Parameters#

  • mfn - the matrix function solver context

  • tol - the convergence tolerance

  • maxits - maximum number of iterations to use

Options Database Keys#

  • -mfn_tol <tol> - sets the convergence tolerance

  • -mfn_max_it <maxits> - sets the maximum number of iterations allowed

Notes#

Use PETSC_CURRENT to retain the current value of any of the parameters. Use PETSC_DETERMINE for either argument to assign a default value computed internally (may be different in each solver). For maxits use PETSC_UNLIMITED to indicate there is no upper bound on this value.

See Also#

MFN: Matrix Function, MFNGetTolerances()

Level#

intermediate

Location#

src/mfn/interface/mfnopts.c

Examples#

src/mfn/tutorials/ex23.c
src/mfn/tutorials/ex23f.F90

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