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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="DMCreateDomainDecomposition"><H1>DMCreateDomainDecomposition</H1></A>
Returns lists of <A HREF="../IS/IS.html#IS">IS</A> objects defining a decomposition of a problem into subproblems corresponding to restrictions to pairs nested subdomains: each <A HREF="../IS/IS.html#IS">IS</A> contains the global indices of the dofs of the corresponding subdomains. The inner subdomains conceptually define a nonoverlapping covering, while outer subdomains can overlap. The optional list of DMs define the <A HREF="../DM/DM.html#DM">DM</A> for each subproblem.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
#include "petscdmlabel.h"
#include "petscds.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DM/DMCreateDomainDecomposition.html#DMCreateDomainDecomposition">DMCreateDomainDecomposition</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *len, char ***namelist, <A HREF="../IS/IS.html#IS">IS</A> **innerislist, <A HREF="../IS/IS.html#IS">IS</A> **outerislist, <A HREF="../DM/DM.html#DM">DM</A> **dmlist)
</PRE>
Not collective
<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>dm </B></TD><TD>- the <A HREF="../DM/DM.html#DM">DM</A> object
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>len </B></TD><TD>- The number of subproblems in the domain decomposition (or NULL if not requested)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>namelist </B></TD><TD>- The name for each subdomain (or NULL if not requested)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>innerislist </B></TD><TD>- The global indices for each inner subdomain (or NULL, if not requested)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>outerislist </B></TD><TD>- The global indices for each outer subdomain (or NULL, if not requested)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dmlist </B></TD><TD>- The DMs for each subdomain subproblem (or NULL, if not requested; if NULL is returned, no DMs are defined)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The user is responsible for freeing all requested arrays. In particular, every entry of names should be freed with
<A HREF="../Sys/PetscFree.html#PetscFree">PetscFree</A>(), every entry of is should be destroyed with <A HREF="../IS/ISDestroy.html#ISDestroy">ISDestroy</A>(), every entry of dm should be destroyed with <A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(),
and all of the arrays should be freed with <A HREF="../Sys/PetscFree.html#PetscFree">PetscFree</A>().
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(), <A HREF="../DM/DMView.html#DMView">DMView</A>(), <A HREF="../DM/DMCreateInterpolation.html#DMCreateInterpolation">DMCreateInterpolation</A>(), <A HREF="../DM/DMCreateColoring.html#DMCreateColoring">DMCreateColoring</A>(), <A HREF="../DM/DMCreateMatrix.html#DMCreateMatrix">DMCreateMatrix</A>(), <A HREF="../DM/DMCreateFieldDecomposition.html#DMCreateFieldDecomposition">DMCreateFieldDecomposition</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/interface/dm.c.html#DMCreateDomainDecomposition">src/dm/interface/dm.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/dm/impls/da/dadd.c.html#DMCreateDomainDecomposition_DA">DMCreateDomainDecomposition_DA in src/dm/impls/da/dadd.c</A><BR>
<BR><A HREF="./index.html">Index of all DM routines</A>
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