# MatSolveAdd

Computes x = y + inv(A)*b, given a factored matrix.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode PETSCMAT_DLLEXPORT MatSolveAdd(Mat mat,Vec b,Vec y,Vec x)

Collective on Mat and Vec

### Input Parameters

| mat | - the factored matrix
| b | - the right-hand-side vector
| y | - the vector to be added to

### Output Parameter

x -the result vector

### Notes

The vectors b and x cannot be the same. I.e., one cannot call MatSolveAdd(A,x,y,x).

Most users should employ the simplified KSP interface for linear solvers instead of working directly with matrix algebra routines such as this. See, e.g., KSPCreate().

### See Also

MatSolve(), MatSolveTranspose(), MatSolveTransposeAdd()

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