TSDefaultComputeJacobianColor

Computes the Jacobian using finite differences and coloring to exploit matrix sparsity.

Synopsis

#include "petscmat.h"  
#include "petscts.h"  
int TSDefaultComputeJacobianColor(TS ts,PetscReal t,Vec x1,Mat *J,Mat *B,MatStructure *flag,void *ctx)
Collective on TS, Vec and Mat

Input Parameters

ts - nonlinear solver object
t - current time
x1 - location at which to evaluate Jacobian
ctx - coloring context, where ctx must have type MatFDColoring, as created via MatFDColoringCreate()

Output Parameters

J - Jacobian matrix (not altered in this routine)
B - newly computed Jacobian matrix to use with preconditioner (generally the same as J)
flag - flag indicating whether the matrix sparsity structure has changed

Options Database Keys

 -mat_fd_coloring_freq <freq> 

Keywords

TS, finite differences, Jacobian, coloring, sparse

See Also

TSSetJacobian(), MatFDColoringCreate(), MatFDColoringSetFunction()

Level:intermediate
Location:
src/ts/interface/tsfd.c
Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ts/examples/tutorials/ex7.c.html