MatSNESMFMoreSetParameters#

Sets the parameters for the approximation of matrix-vector products using finite differences, see MatCreateSNESMFMore()

Synopsis#

#include "petscsnes.h"   
PetscErrorCode MatSNESMFMoreSetParameters(Mat mat, PetscReal error, PetscReal umin, PetscReal h)

Input Parameters#

  • mat - the matrix

  • error - relative error (should be set to the square root of the relative error in the function evaluations)

  • umin - minimum allowable u-value

  • h - differencing parameter

Options Database Keys#

  • -snes_mf_err <error_rel> - see MatCreateSNESMF()

  • -snes_mf_umin - see MatCreateSNESMF()

  • -snes_mf_compute_err - compute the square root or relative error in function

  • -snes_mf_freq_err - set the frequency to recompute the parameters

  • -snes_mf_jorge - use the method of Jorge More

Note#

If the user sets the parameter h directly, then this value will be used instead of the default computation as discussed in MatCreateSNESMFMore()

See Also#

SNES: Nonlinear Solvers, SNES, MatCreateSNESMF(), MatCreateSNESMFMore()

Level#

advanced

Location#

src/snes/interface/noise/snesmfj2.c

Index of all SNES routines
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Index of all manual pages