petsc-3.3-p7 2013-05-11

MatFDColoringApply

 Given a matrix for which a MatFDColoring context has been created, computes the Jacobian for a function via finite differences.

Synopsis

#include "petscmat.h" 
PetscErrorCode  MatFDColoringApply(Mat J,MatFDColoring coloring,Vec x1,MatStructure *flag,void *sctx)
Collective on MatFDColoring

Input Parameters

mat - location to store Jacobian
coloring - coloring context created with MatFDColoringCreate()
x1 - location at which Jacobian is to be computed
sctx - context required by function, if this is being used with the SNES solver then it is SNES object, otherwise it is null

Options Database Keys

-mat_fd_type - "wp" or "ds" (see MATMFFD_WP or MATMFFD_DS)
-mat_fd_coloring_view - Activates basic viewing or coloring
-mat_fd_coloring_view_draw - Activates drawing of coloring
-mat_fd_coloring_view_info - Activates viewing of coloring info

See Also

MatFDColoringCreate(), MatFDColoringDestroy(), MatFDColoringView(), MatFDColoringSetFunction()

Keywords

coloring, Jacobian, finite differences

Level:intermediate
Location:src/mat/matfd/fdmatrix.c
Index of all MatFD routines
Table of Contents for all manual pages
Index of all manual pages