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<A NAME="MGDefaultResidual"><H1>MGDefaultResidual</H1></A>
Default routine to calculate the residual.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
#include "petscmg.h"
int MGDefaultResidual(Mat mat,Vec b,Vec x,Vec r)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A> and <A HREF="../Vec/Vec.html#Vec">Vec</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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>b </B></TD><TD>- the right-hand-side
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- the approximate solution
</TD></TR></TABLE>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>r </B> -location to store the residual
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
MG, default, multigrid, residual
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/MGSetResidual.html#MGSetResidual">MGSetResidual</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/mg/mgfunc.c.html#MGDefaultResidual">src/ksp/pc/impls/mg/mgfunc.c</A>
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