DAGetMatrix
Creates a matrix with the correct parallel layout and nonzero structure required for computing the Jacobian on a function defined using the stencil set in the DA.
Synopsis
#include "petscda.h"
#include "petscmat.h"
int DAGetMatrix(DA da,MatType mtype,Mat *J)
Collective on DA
Input Parameter
| da | - the distributed array
|
| mtype | - either MATMPIAIJ or MATMPIBAIJ
|
Output Parameters
J -matrix with the correct nonzero structure
(obviously without the correct Jacobian values)
Notes: This properly preallocates the number of nonzeros in the sparse matrix so you
do not need to do it yourself.
See Also
ISColoringView(), ISColoringGetIS(), MatFDColoringCreate()
Level:advanced
Location:src/dm/da/utils/fdda.c
Index of all DA routines
Table of Contents for all manual pages
Index of all manual pages
Examples
src/snes/examples/tutorials/ex5.c.html
src/snes/examples/tutorials/ex14.c.html
src/snes/examples/tutorials/ex24.c.html
src/snes/examples/tutorials/ex26.c.html
src/snes/examples/tutorials/ex5f.F.html
src/snes/examples/tutorials/ex5f90.F.html
src/ts/examples/tutorials/ex7.c.html