PETSc version 3.17.4
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# MatDFischer

Calculates an element of the B-subdifferential of the Fischer-Burmeister function for complementarity problems.

### Synopsis

    #include "petsctao.h"
    PetscErrorCode MatDFischer(Mat jac, Vec X, Vec Con, Vec XL, Vec XU, Vec T1, Vec T2, Vec Da, Vec Db)

Collective on jac

### Input Parameters

| jac | - the jacobian of f at X
| X | - current point
| Con | - constraints function evaluated at X
| XL | - lower bounds
| XU | - upper bounds
| t1 | - work vector
| t2 | - work vector

### Output Parameters

| Da | - diagonal perturbation component of the result
| Db | - row scaling component of the result

### See Also

VecFischer()

### Level

developer

### Location

src/tao/util/tao_util.c
Index of all Tao routines
Table of Contents for all manual pages
Index of all manual pages