petsc-3.13.6 2020-09-29

MatGetBrowsOfAcols

Creates a SeqAIJ matrix by taking rows of B that equal to nonzero columns of local A

#include "petscmat.h" 
PetscErrorCode MatGetBrowsOfAcols(Mat A,Mat B,MatReuse scall,IS *rowb,IS *colb,Mat *B_seq)

Collective on Mat

	A,B	- the matrices in mpiaij format
	scall	- either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX
	rowb, colb	- index sets of rows and columns of B to extract (or NULL)

	rowb, colb	- index sets of rows and columns of B to extract
	B_seq	- the sequential matrix generated

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