MatPermute — PETSc 3.23.0 documentation

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# 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_Diagonal() in src/mat/impls/diagonal/diagonal.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

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages