:orphan:
# MatComputeOperatorTranspose
Computes the explicit matrix representation of a give matrix that can apply `MatMultTranspose()` 
## Synopsis
```
#include "petscmat.h"  
PetscErrorCode MatComputeOperatorTranspose(Mat inmat, MatType mattype, Mat *mat)
```
Collective


## Input Parameters

- ***inmat -*** the matrix
- ***mattype -*** the matrix type for the explicit operator



## Output Parameter

- ***mat -*** the explicit  operator transposed





## Note
This computation is done by applying the transpose of the operator to columns of the identity matrix.
This routine is costly in general, and is recommended for use only with relatively small systems.
Currently, this routine uses a dense matrix format if `mattype` == `NULL`.


## See Also
 [](ch_matrices), `Mat`, `MatConvert()`, `MatMult()`, `MatComputeOperator()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/utils/axpy.c.html#MatComputeOperatorTranspose">src/mat/utils/axpy.c</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/utils/axpy.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)