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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="PCCompositeType"><H1>PCCompositeType</H1></A>
Determines how two or more preconditioner are composed
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
typedef enum {<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_ADDITIVE</A>,<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_MULTIPLICATIVE</A>,<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SYMMETRIC_MULTIPLICATIVE</A>,<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SPECIAL</A>,<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SCHUR</A>} <A HREF="../PC/PCCompositeType.html#PCCompositeType">PCCompositeType</A>;
</PRE>
<pre>
<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_ADDITIVE</A> - results from application of all preconditioners are added together
</pre>
<pre>
<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_MULTIPLICATIVE</A> - preconditioners are applied sequentially to the residual freshly
</pre>
<pre>
computed after the previous preconditioner application
</pre>
<pre>
<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SYMMETRIC_MULTIPLICATIVE</A> - preconditioners are applied sequentially to the residual freshly
</pre>
<pre>
computed from first preconditioner to last and then back (Use only for symmetric matrices and preconditioners)
</pre>
<pre>
<A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SPECIAL</A> - This is very special for a matrix of the form alpha I + R + S
</pre>
<pre>
where first preconditioner is built from alpha I + S and second from
</pre>
<pre>
alpha I + R
</pre>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCCompositeSetType.html#PCCompositeSetType">PCCompositeSetType</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/pc/../../../include/petscpctypes.h.html#PCCompositeType">src/ksp/pc/../../../include/petscpctypes.h</A>
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