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