VecPackGetMatrix

 Creates a matrix with the correct parallel layout and nonzero structure required for computing the Jacobian on a function defined using the stencils set in the DA's and coupling in the array variables

Synopsis

#include "petscda.h"     
PetscErrorCode PETSCDM_DLLEXPORT VecPackGetMatrix(VecPack packer, MatType mtype,Mat *J)
Collective on DA

Input Parameter

da - the distributed array
mtype - Supported types are MATSEQAIJ, MATMPIAIJ

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

DAGetMatrix(), VecPackCreate()

Level:advanced
Location:src/dm/da/utils/pack.c
Index of all DA routines
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Index of all manual pages