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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="DMCreateDomainDecompositionScatters"><H1>DMCreateDomainDecompositionScatters</H1></A>
Returns scatters to the subdomain vectors from the global vector
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
PetscErrorCode DMCreateDomainDecompositionScatters(DM dm,PetscInt n,DM *subdms,VecScatter **iscat,VecScatter **oscat,VecScatter **gscat)
</PRE>
Not collective
<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 DM object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- the number of subdomain scatters
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>subdms </B></TD><TD>- the local subdomains
</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>n </B></TD><TD>- the number of scatters returned
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>iscat </B></TD><TD>- scatter from global vector to nonoverlapping global vector entries on subdomain
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>oscat </B></TD><TD>- scatter from global vector to overlapping global vector entries on subdomain
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>gscat </B></TD><TD>- scatter from global vector to local vector on subdomain (fills in ghosts)
</TD></TR></TABLE>
<P>
Notes: This is an alternative to the iis and ois arguments in <A HREF="../DM/DMCreateDomainDecomposition.html#DMCreateDomainDecomposition">DMCreateDomainDecomposition</A> that allow for the solution
of general nonlinear problems with overlapping subdomain methods. While merely having index sets that enable subsets
of the residual equations to be created is fine for linear problems, nonlinear problems require local assembly of
solution and residual data.
<P>
<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/DMCreateFieldIS.html#DMCreateFieldIS">DMCreateFieldIS</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/interface/dm.c.html#DMCreateDomainDecompositionScatters">src/dm/interface/dm.c</A>
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