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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="MATNEST"><H1>MATNEST</H1></A>
<A HREF="../Mat/MATNEST.html#MATNEST">MATNEST</A> = "nest" - Matrix type consisting of nested submatrices, each stored separately.
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This matrix type permits scalable use of PCFieldSplit and avoids the large memory costs of extracting submatrices.
It allows the use of symmetric and block formats for parts of multi-physics simulations.
It is usually used with DMComposite and <A HREF="../DM/DMCreateMatrix.html#DMCreateMatrix">DMCreateMatrix</A>()
<P>
Each of the submatrices lives on the same MPI communicator as the original nest matrix (though they can have zero
rows/columns on some processes.) Thus this is not meant for cases where the submatrices live on far fewer processes
than the nest matrix.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreate.html#MatCreate">MatCreate</A>(), <A HREF="../Mat/MatType.html#MatType">MatType</A>, <A HREF="../Mat/MatCreateNest.html#MatCreateNest">MatCreateNest</A>(), <A HREF="../Mat/MatNestSetSubMat.html#MatNestSetSubMat">MatNestSetSubMat</A>(), <A HREF="../Mat/MatNestGetSubMat.html#MatNestGetSubMat">MatNestGetSubMat</A>(),
<BR><A HREF="../Vec/VecCreateNest.html#VecCreateNest">VecCreateNest</A>(), <A HREF="../DM/DMCreateMatrix.html#DMCreateMatrix">DMCreateMatrix</A>(), <A HREF="../DM/DMCOMPOSITE.html#DMCOMPOSITE">DMCOMPOSITE</A>, <A HREF="../Mat/MatNestSetVecType.html#MatNestSetVecType">MatNestSetVecType</A>(), <A HREF="../Mat/MatNestGetLocalISs.html#MatNestGetLocalISs">MatNestGetLocalISs</A>(),
<A HREF="../Mat/MatNestGetISs.html#MatNestGetISs">MatNestGetISs</A>(), <A HREF="../Mat/MatNestSetSubMats.html#MatNestSetSubMats">MatNestSetSubMats</A>(), <A HREF="../Mat/MatNestGetSubMats.html#MatNestGetSubMats">MatNestGetSubMats</A>()
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/impls/nest/matnest.c.html#MATNEST">src/mat/impls/nest/matnest.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/tutorials/ex28.c.html">src/snes/tutorials/ex28.c.html</A><BR>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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