PETSc version 3.17.4
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# MatMFFDSetBase

Sets the vector U at which matrix vector products of the Jacobian are computed

### Synopsis

    #include "petscmat.h"
    PetscErrorCode  MatMFFDSetBase(Mat J,Vec U,Vec F)

Logically Collective on Mat

### Input Parameters

| J | - the MatMFFD matrix
| U | - the vector
| F | - (optional) vector that contains F(u) if it has been already computed

### Notes

This is rarely used directly

If F is provided then it is not recomputed. Otherwise the function is evaluated at the base point during the first MatMult() after each call to MatMFFDSetBase().

### Level

advanced

### Location

src/mat/impls/mffd/mffd.c

### Examples

src/snes/tutorials/ex22.c.html

### Implementations

MatMFFDSetBase_MFFD in src/mat/impls/mffd/mffd.c
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