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#
Level#
intermediate
Location#
Examples#
Implementations#
FNPhiSetIndex_Phi() in src/sys/classes/fn/impls/phi/fnphi.c
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