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# MatSeqBAIJSetColumnIndices
Set the column indices for all the rows in the matrix.
## Synopsis
```
#include "petscmat.h"
PetscErrorCode MatSeqBAIJSetColumnIndices(Mat mat, PetscInt *indices)
```
## Input Parameters
- ***mat -*** the `MATSEQBAIJ` matrix
- ***indices -*** the column indices
## Notes
This can be called if you have precomputed the nonzero structure of the
matrix and want to provide it to the matrix object to improve the performance
of the `MatSetValues()` operation.
You MUST have set the correct numbers of nonzeros per row in the call to
`MatCreateSeqBAIJ()`, and the columns indices MUST be sorted.
MUST be called before any calls to `MatSetValues()`
## See Also
[](ch_matrices), `Mat`, `MATSEQBAIJ`, `MatSetValues()`
## Level
advanced
## Location
src/mat/impls/baij/seq/baij.c
## Implementations
MatSeqBAIJSetColumnIndices_SeqBAIJ in src/mat/impls/baij/seq/baij.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/baij/seq/baij.c)
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