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# TaoBRGNSetDictionaryMatrix
bind the dictionary matrix from user application context to gn->D, for compressed sensing (with least-squares problem)
## Synopsis
```
#include "petsctao.h"
PetscErrorCode TaoBRGNSetDictionaryMatrix(Tao tao, Mat dict)
```
## Input Parameters
- ***tao -*** the `Tao` context
- ***dict -*** the user specified dictionary matrix. We allow to set a `NULL` dictionary, which means identity matrix by default
## See Also
`Tao`, `Mat`, `TAOBRGN`
## Level
advanced
## Location
src/tao/leastsquares/impls/brgn/brgn.c
## Examples
src/tao/leastsquares/tutorials/cs1.c
src/tao/leastsquares/tutorials/tomography.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/tao/leastsquares/impls/brgn/brgn.c)
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