slepc-3.22.2 2024-12-02

DSNEPSetComputeMatrixFunction

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

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

Logically Collective

	ds	- the direct solver context
	fun	- matrix function evaluation routine, see DSNEPMatrixFunctionFn for the calling sequence
	ctx	- a context pointer (the last parameter to the user function)

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

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