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<A NAME="MGSetResidual"><H1>MGSetResidual</H1></A>
Sets the function to be used to calculate the residual on the lth level.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsles.h"
#include "petscmg.h"
int MGSetResidual(PC pc,int l,int (*residual)(Mat,Vec,Vec,Vec),Mat mat)
</PRE>
Collective on <A HREF="../PC/PC.html#PC">PC</A> and <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pc </B></TD><TD>- the multigrid context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>l </B></TD><TD>- the level to supply
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>residual </B></TD><TD>- function used to form residual (usually <A HREF="../PC/MGDefaultResidual.html#MGDefaultResidual">MGDefaultResidual</A>)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mat </B></TD><TD>- matrix associated with residual
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
MG, set, multigrid, residual, level
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/MGDefaultResidual.html#MGDefaultResidual">MGDefaultResidual</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sles/pc/impls/mg/mgfunc.c.html#MGSetResidual">src/sles/pc/impls/mg/mgfunc.c</A>
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