slepc-3.22.2 2024-12-02
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# DSNEPMatrixFunctionFn

A prototype of a DSNEP compute matrix function that would be passed to DSNEPSetComputeMatrixFunction()

### Synopsis

    PETSC_EXTERN_TYPEDEF typedef PetscErrorCode(DSNEPMatrixFunctionFn)(DS ds,PetscScalar lambda,PetscBool deriv,DSMatType mat,void *ctx);

### Calling Sequence

| ds | - the direct solver object
| lambda | - point where T(lambda) or T'(lambda) must be evaluated
| deriv | - if true compute T'(lambda), otherwise compute T(lambda)
| mat | - the DS matrix where the result must be stored
| ctx | - [optional] user-defined context for private data for the matrix evaluation routine (may be `NULL`)

### See Also

DSNEPSetComputeMatrixFunction()

### Level

developer

### Location

include/slepcds.h
Index of all DS routines
Table of Contents for all manual pages
Index of all manual pages