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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>NEPNLEIGSSetSingularitiesFunction</H1>
Sets a user function to compute a discretization of the singularity set (where T(.) is not analytic).
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcnep.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../NEP/NEPNLEIGSSetSingularitiesFunction.html#NEPNLEIGSSetSingularitiesFunction">NEPNLEIGSSetSingularitiesFunction</A>(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (*fun)(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> *maxnp,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *xi,void *ctx),void *ctx)
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#883300">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nep </B></TD><TD> - the <A HREF="../NEP/NEP.html#NEP">NEP</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fun </B></TD><TD> - user function (if NULL then <A HREF="../NEP/NEP.html#NEP">NEP</A> retains any previously set value)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD> - [optional] user-defined context for private data for the function
(may be NULL, in which case <A HREF="../NEP/NEP.html#NEP">NEP</A> retains any previously set value)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Calling sequence of fun</FONT></H3>
<pre>
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> fun(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> *maxnp,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *xi,void *ctx)
</pre>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nep </B></TD><TD> - the <A HREF="../NEP/NEP.html#NEP">NEP</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>maxnp </B></TD><TD> - on input number of requested points in the discretization (can be set)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>xi </B></TD><TD> - computed values of the discretization
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD> - optional context, as set by <A HREF="../NEP/NEPNLEIGSSetSingularitiesFunction.html#NEPNLEIGSSetSingularitiesFunction">NEPNLEIGSSetSingularitiesFunction</A>()
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The user-defined function can set a smaller value of maxnp if necessary.
It is wrong to return a larger value.
<P>
If the problem type has been set to rational with <A HREF="../NEP/NEPSetProblemType.html#NEPSetProblemType">NEPSetProblemType</A>(),
then it is not necessary to set the singularities explicitly since the
solver will try to determine them automatically.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../NEP/NEPNLEIGSGetSingularitiesFunction.html#NEPNLEIGSGetSingularitiesFunction">NEPNLEIGSGetSingularitiesFunction</A>(), <A HREF="../NEP/NEPSetProblemType.html#NEPSetProblemType">NEPSetProblemType</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/nep/impls/nleigs/nleigs.c.html#NEPNLEIGSSetSingularitiesFunction">src/nep/impls/nleigs/nleigs.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/nep/tutorials/ex27.c.html">src/nep/tutorials/ex27.c</A><BR>
<A HREF="../../../src/nep/tutorials/ex27f.F90.html">src/nep/tutorials/ex27f.F90</A><BR>
<BR><BR><A HREF="./index.html">Index of all NEP routines</A>
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