# MatDiagonalScale

Scales a matrix on the left and right by diagonal matrices that are stored as vectors. Either of the two scaling matrices can be PETSC_NULL.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode  MatDiagonalScale(Mat mat,Vec l,Vec r)

Collective on Mat

### Input Parameters

| mat | - the matrix to be scaled
| l | - the left scaling vector (or PETSC_NULL)
| r | - the right scaling vector (or PETSC_NULL)

### Notes

MatDiagonalScale() computes A = LAR, where L = a diagonal matrix (stored as a vector), R = a diagonal matrix (stored as a vector)

### See Also

MatScale()

Level:intermediate
Location:src/mat/interface/matrix.c
Index of all Mat routines
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Index of all manual pages