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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="DMDASetBlockFills"><H1>DMDASetBlockFills</H1></A>
Sets the fill pattern in each block for a multi-component problem of the matrix returned by <A HREF="../DM/DMCreateMatrix.html#DMCreateMatrix">DMCreateMatrix</A>().
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
PetscErrorCode DMDASetBlockFills(DM da,const PetscInt *dfill,const PetscInt *ofill)
</PRE>
Logically Collective on <A HREF="../DM/DMDA.html#DMDA">DMDA</A>
<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>da </B></TD><TD>- the distributed array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dfill </B></TD><TD>- the fill pattern in the diagonal block (may be NULL, means use dense block)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ofill </B></TD><TD>- the fill pattern in the off-diagonal blocks
</TD></TR></TABLE>
<P>
<P>
<P>
Notes: This only makes sense when you are doing multicomponent problems but using the
MPIAIJ matrix format
<P>
The format for dfill and ofill is a 2 dimensional dof by dof matrix with 1 entries
representing coupling and 0 entries for missing coupling. For example
<pre>
dfill[9] = {1, 0, 0,
</pre>
<pre>
1, 1, 0,
</pre>
<pre>
0, 1, 1}
</pre>
means that row 0 is coupled with only itself in the diagonal block, row 1 is coupled with
itself and row 0 (in the diagonal block) and row 2 is coupled with itself and row 1 (in the
diagonal block).
<P>
<A HREF="../DM/DMDASetGetMatrix.html#DMDASetGetMatrix">DMDASetGetMatrix</A>() allows you to provide general code for those more complicated nonzero patterns then
can be represented in the dfill, ofill format
<P>
Contributed by Glenn Hammond
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMCreateMatrix.html#DMCreateMatrix">DMCreateMatrix</A>(), <A HREF="../DM/DMDASetGetMatrix.html#DMDASetGetMatrix">DMDASetGetMatrix</A>(), <A HREF="../DM/DMSetMatrixPreallocateOnly.html#DMSetMatrixPreallocateOnly">DMSetMatrixPreallocateOnly</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/da/fdda.c.html#DMDASetBlockFills">src/dm/impls/da/fdda.c</A>
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