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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
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<TITLE>DMMGCreate</TITLE>
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<A NAME="DMMGCreate"><H1>DMMGCreate</H1></A>
Creates a DM based multigrid solver object. This allows one to easily implement MG methods on regular grids.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
#include "petscksp.h"
#include "petscpcmg.h"
#include "petscdmmg.h"
#include "petscpc.h"
PetscErrorCode DMMGCreate(MPI_Comm comm,PetscInt nlevels,void *user,DMMG **dmmg)
</PRE>
This is being deprecated. Use <A HREF="../KSP/KSPSetDM.html#KSPSetDM">KSPSetDM</A>() for linear problems and <A HREF="../SNES/SNESSetDM.html#SNESSetDM">SNESSetDM</A>() for nonlinear problems.
See src/ksp/ksp/examples/tutorials/ex45.c and src/snes/examples/tutorials/ex57.c
<P>
Collective on <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>comm </B></TD><TD>- the processors that will share the grids and solution process
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nlevels </B></TD><TD>- number of multigrid levels (if this is negative it CANNOT be reset with -dmmg_nlevels
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>user </B></TD><TD>- an optional user context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>- the context</B> -
Options Database:
+ -dmmg_nlevels <levels> - number of levels to use
<br>
<DT><B>-pc_mg_galerkin </B> -use Galerkin approach to compute coarser matrices
<br>
<DT><B>-dmmg_mat_type <type> </B> -matrix type that <A HREF="../DMMG/DMMG.html#DMMG">DMMG</A> should create, defaults to <A HREF="../Mat/MATAIJ.html#MATAIJ">MATAIJ</A>
<br>
</TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
To provide a different user context for each level call <A HREF="../DMMG/DMMGSetUser.html#DMMGSetUser">DMMGSetUser</A>() after calling
this routine
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DMMG/DMMGDestroy.html#DMMGDestroy">DMMGDestroy</A>(), <A HREF="../DMMG/DMMGSetUser.html#DMMGSetUser">DMMGSetUser</A>(), <A HREF="../DMMG/DMMGGetUser.html#DMMGGetUser">DMMGGetUser</A>(), <A HREF="../DMMG/DMMGSetMatType.html#DMMGSetMatType">DMMGSetMatType</A>(), <A HREF="../DMMG/DMMGSetNullSpace.html#DMMGSetNullSpace">DMMGSetNullSpace</A>(), <A HREF="../DMMG/DMMGSetInitialGuess.html#DMMGSetInitialGuess">DMMGSetInitialGuess</A>(),
<BR><A HREF="../DMMG/DMMGSetISColoringType.html#DMMGSetISColoringType">DMMGSetISColoringType</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/utils/damg.c.html#DMMGCreate">src/snes/utils/damg.c</A>
<BR><A HREF="./index.html">Index of all DMMG routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex22.c.html">src/ksp/ksp/examples/tutorials/ex22.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex25.c.html">src/ksp/ksp/examples/tutorials/ex25.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex28.c.html">src/ksp/ksp/examples/tutorials/ex28.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex29.c.html">src/ksp/ksp/examples/tutorials/ex29.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex31.c.html">src/ksp/ksp/examples/tutorials/ex31.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex32.c.html">src/ksp/ksp/examples/tutorials/ex32.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex34.c.html">src/ksp/ksp/examples/tutorials/ex34.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex35.c.html">src/ksp/ksp/examples/tutorials/ex35.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex37.c.html">src/ksp/ksp/examples/tutorials/ex37.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex47.c.html">src/ksp/ksp/examples/tutorials/ex47.c.html</A><BR>
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