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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/MatOrderings/MatCoarsenApply.html "><small>Report Typos and Errors</small></a></div>
<A NAME="MatCoarsenApply"><H1>MatCoarsenApply</H1></A>
Gets a coarsen for a matrix.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmatcoarsen.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../MatOrderings/MatCoarsenApply.html#MatCoarsenApply">MatCoarsenApply</A>(MatCoarsen coarser)
</PRE>
Collective on MatCoarsen
<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>coarsen </B></TD><TD>- the coarsen
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
To specify the coarsen through the options database, use one of
the following
<pre>
-mat_coarsen_type mis
</pre>
To see the coarsen result
<pre>
-mat_coarsen_view
</pre>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Use <A HREF="../MatOrderings/MatCoarsenGetData.html#MatCoarsenGetData">MatCoarsenGetData</A>() to access the results of the coarsening
<P>
The user can define additional coarsens; see <A HREF="../MatOrderings/MatCoarsenRegister.html#MatCoarsenRegister">MatCoarsenRegister</A>().
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../MatOrderings/MatCoarsenRegister.html#MatCoarsenRegister">MatCoarsenRegister</A>(), <A HREF="../MatOrderings/MatCoarsenCreate.html#MatCoarsenCreate">MatCoarsenCreate</A>(),
<BR><A HREF="../MatOrderings/MatCoarsenDestroy.html#MatCoarsenDestroy">MatCoarsenDestroy</A>(), <A HREF="../MatOrderings/MatCoarsenSetAdjacency.html#MatCoarsenSetAdjacency">MatCoarsenSetAdjacency</A>()
<A HREF="../MatOrderings/MatCoarsenGetData.html#MatCoarsenGetData">MatCoarsenGetData</A>()
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/coarsen/coarsen.c.html#MatCoarsenApply">src/mat/coarsen/coarsen.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/coarsen/impls/hem/hem.c.html#MatCoarsenApply_HEM">MatCoarsenApply_HEM in src/mat/coarsen/impls/hem/hem.c</A><BR>
<A HREF="../../../src/mat/coarsen/impls/mis/mis.c.html#MatCoarsenApply_MIS">MatCoarsenApply_MIS in src/mat/coarsen/impls/mis/mis.c</A><BR>
<BR><A HREF="./index.html">Index of all MatOrderings routines</A>
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