MatGetBrowsOfAoCols
Creates a SeqAIJ matrix by taking rows of B that equal to nonzero columns of the OFF-DIAGONAL portion of local A
Synopsis
#include "petscmat.h"
PetscErrorCode PETSCMAT_DLLEXPORT MatGetBrowsOfAoCols(Mat A,Mat B,MatReuse scall,PetscInt **startsj,PetscScalar **bufa_ptr,Mat *B_oth)
Collective on Mat
Input Parameters
| A,B | - the matrices in mpiaij format
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| scall | - either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX
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| startsj | - starting point in B's sending and receiving j-arrays, saved for MAT_REUSE (or PETSC_NULL)
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| bufa_ptr | - array for sending matrix values, saved for MAT_REUSE (or PETSC_NULL)
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Output Parameter