MatFDColoringGetFrequency

Gets the frequency for computing new Jacobian matrices.

Synopsis

#include "petscmat.h" 
int MatFDColoringGetFrequency(MatFDColoring matfd,int *freq)

Not Collective

Input Parameters

coloring -the coloring context

Output Parameters

freq -frequency (default is 1)

Options Database Keys

-mat_fd_coloring_freq <freq> -Sets coloring frequency

Notes

Using a modified Newton strategy, where the Jacobian remains fixed for several iterations, can be cost effective in terms of overall nonlinear solution efficiency. This parameter indicates that a new Jacobian will be computed every <freq> nonlinear iterations.

Keywords

Mat, finite differences, coloring, get, frequency