MatEliminateZeros#
eliminate the nondiagonal zero entries in place from the nonzero structure of a sparse Mat in place, meaning the same memory is used for the matrix, and no new memory is allocated.
Synopsis#
#include "petscmat.h"
PetscErrorCode MatEliminateZeros(Mat A, PetscBool keep)
Collective
Input Parameters#
A - the matrix
keep - if for a given row of
A, the diagonal coefficient is zero, indicates whether it should be left in the structure or eliminated as well
Developer Note#
The entries in the sparse matrix data structure are shifted to fill in the unneeded locations in the data. Thus the end of the arrays in the data structure are unneeded.
See Also#
Matrices, Mat, MatCreate(), MatCreateGraph(), MatFilter()
Level#
intermediate
Location#
Implementations#
MatEliminateZeros_MPIAIJ() in src/mat/impls/aij/mpi/mpiaij.c
MatEliminateZeros_SeqAIJ() in src/mat/impls/aij/seq/aij.c
MatEliminateZeros_MPIBAIJ() in src/mat/impls/baij/mpi/mpibaij.c
MatEliminateZeros_SeqBAIJ() in src/mat/impls/baij/seq/baij.c
MatEliminateZeros_MPISBAIJ() in src/mat/impls/sbaij/mpi/mpisbaij.c
MatEliminateZeros_SeqSBAIJ() in src/mat/impls/sbaij/seq/sbaij.c
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