PETSc version 3.17.4
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# MatTranspose

Computes an in-place or out-of-place transpose of a matrix.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatTranspose(Mat mat,MatReuse reuse,Mat *B)

Collective on Mat

### Input Parameters

| mat | - the matrix to transpose
| reuse | - either MAT_INITIAL_MATRIX, MAT_REUSE_MATRIX, or MAT_INPLACE_MATRIX

### Output Parameter

| B | - the transpose

### Notes

If you use MAT_INPLACE_MATRIX then you must pass in &mat for B

MAT_REUSE_MATRIX causes the B matrix from a previous call to this function with MAT_INITIAL_MATRIX to be used

Consider using MatCreateTranspose() instead if you only need a matrix that behaves like the transpose, but don't need the storage to be changed.

### See Also

MatMultTranspose(), MatMultTransposeAdd(), MatIsTranspose(), MatReuse

### Level

intermediate

### Location

src/mat/interface/matrix.c

### Examples

src/ksp/ksp/tutorials/ex43.c.html
src/ksp/ksp/tutorials/ex65.c.html
src/ksp/ksp/tutorials/ex74.c.html
src/snes/tutorials/ex70.c.html
src/tao/pde_constrained/tutorials/parabolic.c.html
src/tao/pde_constrained/tutorials/hyperbolic.c.html

### Implementations

MatTranspose_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatTranspose_SeqAIJKokkos in src/mat/impls/aij/seq/kokkos/aijkok.kokkos.cxx
MatTranspose_SeqAIJ in src/mat/impls/aij/seq/symtranspose.c
MatTranspose_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c
MatTranspose_SeqBAIJ in src/mat/impls/baij/seq/baij.c
MatTranspose_MPIDense in src/mat/impls/dense/mpi/mpidense.c
MatTranspose_SeqDense in src/mat/impls/dense/seq/dense.c
MatTranspose_Elemental in src/mat/impls/elemental/matelem.cxx
MatTranspose_Htool in src/mat/impls/htool/htool.cxx
MatTranspose_IS in src/mat/impls/is/matis.c
MatTranspose_Nest in src/mat/impls/nest/matnest.c
MatTranspose_MPISBAIJ in src/mat/impls/sbaij/mpi/mpisbaij.c
MatTranspose_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaij.c
MatTranspose_ScaLAPACK in src/mat/impls/scalapack/matscalapack.c
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