slepc-3.22.2 2024-12-02

FNPhiSetIndex

Sets the index of the phi-function.

#include "slepcfn.h" 
PetscErrorCode FNPhiSetIndex(FN fn,PetscInt k)

Logically Collective

	fn	- the math function context
	k	- the index

The phi-functions are defined as follows. The default is k=1.

      phi_0(x) = exp(x)
      phi_1(x) = (exp(x)-1)/x
      phi_k(x) = (phi_{k-1}(x)-1/(k-1)!)/x

intermediate