petsc-3.8.4 2018-03-24
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MatFindNonzeroRows

 Locate all rows that are not completely zero in the matrix

Synopsis

#include "petscmat.h" 
PetscErrorCode MatFindNonzeroRows(Mat mat,IS *keptrows)

Input Parameter

A -the matrix

Output Parameter

keptrows -the rows that are not completely zero

Notes: keptrows is set to NULL if all rows are nonzero.

Level:intermediate
Location:src/mat/interface/matrix.c
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