FNPhiSetIndex#

Sets the index of the \(\varphi\)-function.

Synopsis#

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

Logically Collective

Input Parameters#

  • fn - the math function context

  • k - the index

Notes#

The \(\varphi\)-functions are defined as

\[\begin{split}\begin{align} \varphi_0(x)&=e^x,\\ \varphi_1(x)&=\frac{e^x-1}{x},\\ \varphi_k(x)&=\frac{\varphi_{k-1}(x)-1/(k-1)!}{x}. \end{align}\end{split}\]
The default index is \(k=1\).

See Also#

FN: Mathematical Functions, FNPhiGetIndex()

Level#

intermediate

Location#

src/sys/classes/fn/impls/phi/fnphi.c

Examples#

src/mfn/tutorials/ex39.c

Implementations#

FNPhiSetIndex_Phi() in src/sys/classes/fn/impls/phi/fnphi.c


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