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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</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 {PC_COMPOSITE_ADDITIVE,PC_COMPOSITE_MULTIPLICATIVE,PC_COMPOSITE_SYMMETRIC_MULTIPLICATIVE,PC_COMPOSITE_SPECIAL,PC_COMPOSITE_SCHUR} <A HREF="../PC/PCCompositeType.html#PCCompositeType">PCCompositeType</A>;
</PRE>
<pre>
PC_COMPOSITE_ADDITIVE - results from application of all preconditioners are added together
</pre>
<pre>
PC_COMPOSITE_MULTIPLICATIVE - preconditioners are applied sequentially to the residual freshly
</pre>
<pre>
computed after the previous preconditioner application
</pre>
<pre>
PC_COMPOSITE_SYMMETRIC_MULTIPLICATIVE - 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 preconditions)
</pre>
<pre>
PC_COMPOSITE_SPECIAL - 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><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/../../../include/petscpctypes.h.html#PCCompositeType">src/ksp/pc/../../../include/petscpctypes.h</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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