:orphan:
# MatIsHermitianTranspose
Test whether a matrix is another one's Hermitian transpose, 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatIsHermitianTranspose(Mat A, Mat B, PetscReal tol, PetscBool *flg)
```
Collective


## Input Parameters

- ***A -*** the matrix to test
- ***B -*** the matrix to test against, this can equal the first parameter
- ***tol -*** tolerance, differences between entries smaller than this are counted as zero



## Output Parameter

- ***flg -*** the result





## Notes
Only available for `MATAIJ` 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
 [](ch_matrices), `Mat`, `MatTranspose()`, `MatIsSymmetric()`, `MatIsHermitian()`, `MatIsTranspose()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/interface/matrix.c.html#MatIsHermitianTranspose">src/mat/interface/matrix.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/seq/aij.c.html#MatIsHermitianTranspose_SeqAIJ">MatIsHermitianTranspose_SeqAIJ in src/mat/impls/aij/seq/aij.c</A><BR>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/interface/matrix.c)


[Index of all Mat routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)