slepc-3.22.2 2024-12-02
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# NEPJacobianFn

A prototype of a NEP Jacobian evaluation function that would be passed to NEPSetJacobian()

### Synopsis

    PETSC_EXTERN_TYPEDEF typedef PetscErrorCode(NEPJacobianFn)(NEP nep,PetscScalar lambda,Mat J,void *ctx);

### Calling Sequence

| nep | - eigensolver context obtained from NEPCreate()
| lambda | - the scalar argument where T'(.) must be evaluated
| J | - matrix that will contain T'(lambda)
| ctx | - [optional] user-defined context for private data for the Jacobian evaluation routine (may be NULL)

### See Also

NEPSetJacobian()

### Level

beginner

### Location

include/slepcnep.h
Index of all NEP routines
Table of Contents for all manual pages
Index of all manual pages