slepc-3.15.0 2021-03-31

DSNEPSetComputeMatrixFunction

Sets a user-provided subroutine to compute the matrices T(lambda) or T'(lambda).

#include "slepcds.h" 
PetscErrorCode DSNEPSetComputeMatrixFunction(DS ds,PetscErrorCode (*fun)(DS,PetscScalar,PetscBool,DSMatType,void*),void *ctx)

Logically Collective on ds

	ds	- the direct solver context
	fun	- a pointer to the user function
	ctx	- a context pointer (the last parameter to the user function)

  fun(DS ds,PetscScalar lambda,PetscBool deriv,DSMatType mat,void *ctx)

	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 context, as set by DSNEPSetComputeMatrixFunction()

The result is computed as T(lambda) = sum_i E_i*f_i(lambda), and similarly for the derivative.

Location: src/sys/classes/ds/impls/nep/dsnep.c
Index of all DS routines
Table of Contents for all manual pages
Index of all manual pages