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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD>
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<link rel="stylesheet" href="/slepc/slepc.css" type="text/css">
<TITLE>MFNSetOptionsPrefix</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<H1>MFNSetOptionsPrefix</H1>
Sets the prefix used for searching for all <A HREF="../MFN/MFN.html#MFN">MFN</A> options in the database.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcmfn.h"
PetscErrorCode MFNSetOptionsPrefix(MFN mfn,const char *prefix)
</PRE>
Logically Collective on <A HREF="../MFN/MFN.html#MFN">MFN</A>
<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>mfn </B></TD><TD> - the matrix function 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="../MFN/MFN.html#MFN">MFN</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="../MFN/MFN.html#MFN">MFN</A> contexts, one could call
<PRE>
<A HREF="../MFN/MFNSetOptionsPrefix.html#MFNSetOptionsPrefix">MFNSetOptionsPrefix</A>(mfn1,"fun1_")
<A HREF="../MFN/MFNSetOptionsPrefix.html#MFNSetOptionsPrefix">MFNSetOptionsPrefix</A>(mfn2,"fun2_")
</PRE>
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../MFN/MFNAppendOptionsPrefix.html#MFNAppendOptionsPrefix">MFNAppendOptionsPrefix</A>(), <A HREF="../MFN/MFNGetOptionsPrefix.html#MFNGetOptionsPrefix">MFNGetOptionsPrefix</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/mfn/interface/mfnopts.c.html#MFNSetOptionsPrefix">src/mfn/interface/mfnopts.c</A>
<BR><A HREF="./index.html">Index of all MFN routines</A>
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