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   <div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PCCOMPOSITE"><H1>PCCOMPOSITE</H1></A>
Build a preconditioner by composing together several preconditioners 
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_composite_type &lt;type: one of multiplicative, additive, symmetric_multiplicative, special&gt; </B></TD><TD>- Sets composite preconditioner type
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_use_amat </B></TD><TD>- Activates <A HREF="../PC/PCSetUseAmat.html#PCSetUseAmat">PCSetUseAmat</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_composite_pcs </B></TD><TD>- &lt;pc0,pc1,...&gt; list of PCs to compose
</TD></TR></TABLE>
<P>

<P>
<P>
Notes: To use a Krylov method inside the composite preconditioner, set the <A HREF="../PC/PCType.html#PCType">PCType</A> of one or more
inner PCs to be <A HREF="../PC/PCKSP.html#PCKSP">PCKSP</A>.
Using a Krylov method inside another Krylov method can be dangerous (you get divergence or
the incorrect answer) unless you use <A HREF="../KSP/KSPFGMRES.html#KSPFGMRES">KSPFGMRES</A> as the outer Krylov method
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
  <A HREF="../PC/PCCreate.html#PCCreate">PCCreate</A>(), <A HREF="../PC/PCSetType.html#PCSetType">PCSetType</A>(), <A HREF="../PC/PCType.html#PCType">PCType</A> (for list of available types), <A HREF="../PC/PC.html#PC">PC</A>,
<BR><A HREF="../PC/PCSHELL.html#PCSHELL">PCSHELL</A>, <A HREF="../PC/PCKSP.html#PCKSP">PCKSP</A>, <A HREF="../PC/PCCompositeSetType.html#PCCompositeSetType">PCCompositeSetType</A>(), <A HREF="../PC/PCCompositeSpecialSetAlpha.html#PCCompositeSpecialSetAlpha">PCCompositeSpecialSetAlpha</A>(), <A HREF="../PC/PCCompositeAddPC.html#PCCompositeAddPC">PCCompositeAddPC</A>(),
<A HREF="../PC/PCCompositeGetPC.html#PCCompositeGetPC">PCCompositeGetPC</A>(), <A HREF="../PC/PCSetUseAmat.html#PCSetUseAmat">PCSetUseAmat</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/composite/composite.c.html#PCCOMPOSITE">src/ksp/pc/impls/composite/composite.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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