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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD> <link rel="canonical" href="https://slepc.upv.es/documentation/current/docs/manualpages/PEP/PEPSetOptionsPrefix.html" />
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<link rel="stylesheet" href="/slepc.css" type="text/css">
<TITLE>PEPSetOptionsPrefix</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<div id="version" align=right><b>slepc-3.22.2 2024-12-02</b></div>
<div id="bugreport" align=right><a href="mailto:slepc-maint@upv.es?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: slepc-3.22.2 v3.22.2 docs/manualpages/PEP/PEPSetOptionsPrefix.html "><small>Report Typos and Errors</small></a></div>
<H1>PEPSetOptionsPrefix</H1>
Sets the prefix used for searching for all <A HREF="../PEP/PEP.html#PEP">PEP</A> options in the database.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcpep.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PEP/PEPSetOptionsPrefix.html#PEPSetOptionsPrefix">PEPSetOptionsPrefix</A>(<A HREF="../PEP/PEP.html#PEP">PEP</A> pep,const char *prefix)
</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>pep </B></TD><TD> - the polynomial eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>prefix </B></TD><TD> - the prefix string to prepend to all <A HREF="../PEP/PEP.html#PEP">PEP</A> option requests
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
A hyphen (-) must NOT be given at the beginning of the prefix name.
The first character of all runtime options is AUTOMATICALLY the
hyphen.
<P>
For example, to distinguish between the runtime options for two
different <A HREF="../PEP/PEP.html#PEP">PEP</A> contexts, one could call
<PRE>
<A HREF="../PEP/PEPSetOptionsPrefix.html#PEPSetOptionsPrefix">PEPSetOptionsPrefix</A>(pep1,"qeig1_")
<A HREF="../PEP/PEPSetOptionsPrefix.html#PEPSetOptionsPrefix">PEPSetOptionsPrefix</A>(pep2,"qeig2_")
</PRE>
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../PEP/PEPAppendOptionsPrefix.html#PEPAppendOptionsPrefix">PEPAppendOptionsPrefix</A>(), <A HREF="../PEP/PEPGetOptionsPrefix.html#PEPGetOptionsPrefix">PEPGetOptionsPrefix</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/pep/interface/pepopts.c.html#PEPSetOptionsPrefix">src/pep/interface/pepopts.c</A>
<BR><BR><A HREF="./index.html">Index of all PEP routines</A>
<BR><A HREF="../../../docs/manual.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
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