slepc-3.22.2 2024-12-02
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# NEPFunctionFn

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

### Synopsis

    PETSC_EXTERN_TYPEDEF typedef PetscErrorCode(NEPFunctionFn)(NEP nep,PetscScalar lambda,Mat T,Mat P,void *ctx);

### Calling Sequence

| nep | - eigensolver context obtained from NEPCreate()
| lambda | - the scalar argument where T(.) must be evaluated
| T | - matrix that will contain T(lambda)
| P | - [optional] different matrix to build the preconditioner
| ctx | - [optional] user-defined context for private data for the function evaluation routine (may be NULL)

### See Also

NEPSetFunction()

### Level

beginner

### Location

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