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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="DMForestSetAdaptivityPurpose"><H1>DMForestSetAdaptivityPurpose</H1></A>
During the pre-setup phase, set whether the current <A HREF="../DM/DM.html#DM">DM</A> is being adapted from its source (set with <A HREF="../DM/DMForestSetAdaptivityForest.html#DMForestSetAdaptivityForest">DMForestSetAdaptivityForest</A>()) for the purpose of refinement (DM_FOREST_REFINE), coarsening (DM_FOREST_COARSEN), or undefined (DM_FOREST_NONE). This only matters for the purposes of reference counting: during <A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(), cyclic references can be found between DMs only if the cyclic reference is due to a fine/coarse relationship (see <A HREF="../DM/DMSetFineDM.html#DMSetFineDM">DMSetFineDM</A>()/<A HREF="../DM/DMSetCoarseDM.html#DMSetCoarseDM">DMSetCoarseDM</A>()). If the purpose is not refinement or coarsening, and the user does not maintain a reference to the post-adaptation forest (i.e., the one created by <A HREF="../DM/DMForestTemplate.html#DMForestTemplate">DMForestTemplate</A>()), then this can cause a memory leak. This method is used by subtypes of DMForest when automatically constructing mesh hierarchies.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmforest.h"
#include "petscdm.h"
PetscErrorCode DMForestSetAdaptivityPurpose(DM dm, DMForestAdaptivityPurpose purpose)
</PRE>
Logically collective on dm
<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>dm </B></TD><TD>- the forest
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>purpose </B></TD><TD>- the adaptivity purpose (DM_FOREST_NONE/DM_FOREST_REFINE/DM_FOREST_COARSEN)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMForestTemplate.html#DMForestTemplate">DMForestTemplate</A>(), <A HREF="../DM/DMForestSetAdaptivityForest.html#DMForestSetAdaptivityForest">DMForestSetAdaptivityForest</A>(), <A HREF="../DM/DMForestGetAdaptivityForest.html#DMForestGetAdaptivityForest">DMForestGetAdaptivityForest</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/forest/forest.c.html#DMForestSetAdaptivityPurpose">src/dm/impls/forest/forest.c</A>
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