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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="DMCoarsenHookAdd"><H1>DMCoarsenHookAdd</H1></A>
adds a callback to be run when restricting a nonlinear problem to the coarse grid
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
PetscErrorCode DMCoarsenHookAdd(DM fine,PetscErrorCode (*coarsenhook)(DM,DM,void*),PetscErrorCode (*restricthook)(DM,Mat,Vec,Mat,DM,void*),void *ctx)
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fine </B></TD><TD>- nonlinear solver context on which to run a hook when restricting to a coarser level
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>coarsenhook </B></TD><TD>- function to run when setting up a coarser level
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>restricthook </B></TD><TD>- function to run to update data on coarser levels (once per <A HREF="../SNES/SNESSolve.html#SNESSolve">SNESSolve</A>())
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- [optional] user-defined context for provide data for the hooks (may be NULL)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling sequence of coarsenhook</FONT></H3>
<pre>
coarsenhook(DM fine,DM coarse,void *ctx);
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fine </B></TD><TD>- fine level DM
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>coarse </B></TD><TD>- coarse level DM to restrict problem to
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- optional user-defined function context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling sequence for restricthook</FONT></H3>
<pre>
restricthook(DM fine,<A HREF="../Mat/Mat.html#Mat">Mat</A> mrestrict,<A HREF="../Vec/Vec.html#Vec">Vec</A> rscale,<A HREF="../Mat/Mat.html#Mat">Mat</A> inject,DM coarse,void *ctx)
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fine </B></TD><TD>- fine level DM
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mrestrict </B></TD><TD>- matrix restricting a fine-level solution to the coarse grid
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>rscale </B></TD><TD>- scaling vector for restriction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>inject </B></TD><TD>- matrix restricting by injection
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>coarse </B></TD><TD>- coarse level DM to update
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- optional user-defined function context
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This function is only needed if auxiliary data needs to be set up on coarse grids.
<P>
If this function is called multiple times, the hooks will be run in the order they are added.
<P>
In order to compose with nonlinear preconditioning without duplicating storage, the hook should be implemented to
extract the finest level information from its context (instead of from the <A HREF="../SNES/SNES.html#SNES">SNES</A>).
<P>
This function is currently not available from Fortran.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMRefineHookAdd.html#DMRefineHookAdd">DMRefineHookAdd</A>(), <A HREF="../SNES/SNESFASGetInterpolation.html#SNESFASGetInterpolation">SNESFASGetInterpolation</A>(), <A HREF="../SNES/SNESFASGetInjection.html#SNESFASGetInjection">SNESFASGetInjection</A>(), <A HREF="../Sys/PetscObjectCompose.html#PetscObjectCompose">PetscObjectCompose</A>(), <A HREF="../Sys/PetscContainerCreate.html#PetscContainerCreate">PetscContainerCreate</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/interface/dm.c.html#DMCoarsenHookAdd">src/dm/interface/dm.c</A>
<BR><A HREF="./index.html">Index of all DM 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>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/examples/tutorials/ex48.c.html">src/snes/examples/tutorials/ex48.c.html</A><BR>
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