# MatCreateADA
Creates a matrix M=A^T D1 A + D2 where D1, D2 are diagonal 
## Synopsis
```
#include "petscmat.h"  
PetscErrorCode MatCreateADA(Mat mat, Vec d1, Vec d2, Mat *J)
```
Collective on matrix


## Input Parameters

- ***mat -*** matrix of arbitrary type
- ***d1 -*** A vector defining a diagonal matrix
- ***d2 -*** A vector defining a diagonal matrix



## Output Parameters

- ***J -*** New matrix whose operations are defined in terms of mat, D1, and D2.



## Notes
The user provides the input data and is responsible for destroying
this data after matrix J has been destroyed.




## See Also
 `MatCreate()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/matrix/adamat.c.html#MatCreateADA">src/tao/matrix/adamat.c</A>


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


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