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<A NAME="PCMGSetLevels"><H1>PCMGSetLevels</H1></A>
Sets the number of levels to use with MG. Must be called before any other MG routine.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmg.h"
PetscErrorCode PETSCKSP_DLLEXPORT PCMGSetLevels(PC pc,PetscInt levels,MPI_Comm *comms)
</PRE>
Collective on <A HREF="../PC/PC.html#PC">PC</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 preconditioner context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>levels </B></TD><TD>- the number of levels
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>comms </B></TD><TD>- optional communicators for each level; this is to allow solving the coarser problems
on smaller sets of processors. Use PETSC_NULL_OBJECT for default in Fortran
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
If the number of levels is one then the multigrid uses the -mg_levels prefix
for setting the level options rather than the -mg_coarse prefix.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
MG, set, levels, multigrid
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCMGSetType.html#PCMGSetType">PCMGSetType</A>(), <A HREF="../PC/PCMGGetLevels.html#PCMGGetLevels">PCMGGetLevels</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/mg/mg.c.html#PCMGSetLevels">src/ksp/pc/impls/mg/mg.c</A>
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