MatPermute#

Creates a new matrix with rows and columns permuted from the original.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatPermute(Mat mat, IS row, IS col, Mat *B)

Collective

Input Parameters#

  • mat - the matrix to permute

  • row - row permutation, each processor supplies only the permutation for its rows

  • col - column permutation, each processor supplies only the permutation for its columns

Output Parameter#

  • B - the permuted matrix

Note#

The index sets map from row/col of permuted matrix to row/col of original matrix. The index sets should be on the same communicator as mat and have the same local sizes.

Developer Note#

If you want to implement MatPermute() for a matrix type, and your approach doesn’t exploit the fact that row and col are permutations, consider implementing the more general MatCreateSubMatrix() instead.

See Also#

Matrices, Mat, MatGetOrdering(), ISAllGather(), MatCreateSubMatrix()

Level#

advanced

Location#

src/mat/interface/matrix.c

Examples#

src/ksp/ksp/tutorials/ex10.c
src/ksp/ksp/tutorials/ex18.c

Implementations#

MatPermute_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatPermute_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatPermute_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c
MatPermute_Normal in src/mat/impls/normal/normm.c
MatPermute_NormalHermitian in src/mat/impls/normal/normmh.c
MatPermute_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaij.c


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