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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_SPECIAL} PCCompositeType;
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<pre>
PC_COMPOSITE_ADDITIVE - results from application of all preconditioners are added together
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<pre>
PC_COMPOSITE_MULTIPLICATIVE - preconditioners are applied sequentially to the residual freshly
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<pre>
computed after the previous preconditioner application
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<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
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<P>
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<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/sles/pc/../../../include/petscpc.h.html#PCCompositeType">src/sles/pc/../../../include/petscpc.h</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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