:orphan:
# MatViewFromOptions
View properties of the matrix based on options set in the options database
## Synopsis
```
#include "petscmat.h"
PetscErrorCode MatViewFromOptions(Mat A, PetscObject obj, const char name[])
```
Collective
## Input Parameters
- ***A -*** the matrix
- ***obj -*** optional additional object that provides the options prefix to use
- ***name -*** command line option
## Options Database Key
- ***-mat_view [viewertype]:... -*** the viewer and its options
## Notes
```none
If no value is provided ascii:stdout is used
ascii[:[filename][:[format][:append]]] defaults to stdout - format can be one of ascii_info, ascii_info_detail, or ascii_matlab,
for example ascii::ascii_info prints just the information about the object not all details
unless :append is given filename opens in write mode, overwriting what was already there
binary[:[filename][:[format][:append]]] defaults to the file binaryoutput
draw[:drawtype[:filename]] for example, draw:tikz, draw:tikz:figure.tex or draw:x
socket[:port] defaults to the standard output port
saws[:communicatorname] publishes object to the Scientific Application Webserver (SAWs)
```
## See Also
[](ch_matrices), `Mat`, `MatView()`, `PetscObjectViewFromOptions()`, `MatCreate()`
## Level
intermediate
## Location
src/mat/interface/matrix.c
## Examples
src/ksp/ksp/tutorials/ex19.c
src/ksp/ksp/tutorials/ex21.c
src/ksp/ksp/tutorials/ex29.c
src/ksp/ksp/tutorials/ex34.c
src/ksp/ksp/tutorials/ex42.c
src/ksp/ksp/tutorials/ex71.c
src/mat/tutorials/ex10.c
src/snes/tutorials/ex56.c
src/snes/tutorials/ex62.c
---
[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)