PETSc version 3.17.4
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# MatIsTranspose

Test whether a matrix is another one's transpose, or its own, in which case it tests symmetry.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatIsTranspose(Mat A,Mat B,PetscReal tol,PetscBool *flg)

Collective on Mat

### Input Parameters

| A | - the matrix to test
| B | - the matrix to test against, this can equal the first parameter

### Output Parameters

| flg | - the result

### Notes

Only available for SeqAIJ/MPIAIJ matrices. The sequential algorithm has a running time of the order of the number of nonzeros; the parallel test involves parallel copies of the block-offdiagonal parts of the matrix.

### See Also

MatTranspose(), MatIsSymmetric(), MatIsHermitian()

### Level

intermediate

### Location

src/mat/interface/matrix.c

### Implementations

MatIsTranspose_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatIsTranspose_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatIsTranspose_SeqBAIJ in src/mat/impls/baij/seq/baij.c
MatIsTranspose_MPISELL in src/mat/impls/sell/mpi/mpisell.c
Index of all Mat routines
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