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# MatLMVMSymBroydenSetDelta
Sets the starting value for the diagonal scaling vector computed in the SymBrdn approximations (also works for BFGS and DFP). 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode MatLMVMSymBroydenSetDelta(Mat B, PetscScalar delta)
```

## Input Parameters

- ***B -*** LMVM matrix
- ***delta -*** initial value for diagonal scaling





## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/utils/lmvm/symbrdn/symbrdn.c.html#MatLMVMSymBroydenSetDelta">src/ksp/ksp/utils/lmvm/symbrdn/symbrdn.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/ksp/utils/lmvm/symbrdn/symbrdn.c)


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