:orphan:
# PetscViewerBinaryWrite
writes to a binary file, only from the first MPI rank
## Synopsis
```
#include "petscviewer.h"
PetscErrorCode PetscViewerBinaryWrite(PetscViewer viewer, const void *data, PetscInt count, PetscDataType dtype)
```
Collective
## Input Parameters
- ***viewer -*** the `PETSCVIEWERBINARY` viewer
- ***data -*** location of data, treated as an array of the type indicated by `dtype`
- ***count -*** number of items of data to write
- ***dtype -*** type of data to write
## See Also
[](sec_viewers), `PETSCVIEWERBINARY`, `PetscViewerASCIIOpen()`, `PetscViewerPushFormat()`, `PetscViewerDestroy()`,
`VecView()`, `MatView()`, `VecLoad()`, `MatLoad()`, `PetscViewerBinaryGetDescriptor()`, `PetscDataType`
`PetscViewerBinaryGetInfoPointer()`, `PetscFileMode`, `PetscViewer`, `PetscViewerBinaryRead()`
## Level
beginner
## Location
src/sys/classes/viewer/impls/binary/binv.c
## Examples
src/ts/tutorials/ex11_sa.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/impls/binary/binv.c)
[Index of all Viewer routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)