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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.10.3 v3.10.3 docs/manualpages/PC/PCGALERKIN.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PCGALERKIN"><H1>PCGALERKIN</H1></A>
Build (part of) a preconditioner by P S R (where P is often R^T)
<pre>
Use <A HREF="../PC/PCGalerkinSetRestriction.html#PCGalerkinSetRestriction">PCGalerkinSetRestriction</A>(pc,R) and/or <A HREF="../PC/PCGalerkinSetInterpolation.html#PCGalerkinSetInterpolation">PCGalerkinSetInterpolation</A>(pc,P) followed by
</pre>
<pre>
<A HREF="../PC/PCGalerkinGetKSP.html#PCGalerkinGetKSP">PCGalerkinGetKSP</A>(pc,&ksp); <A HREF="../KSP/KSPSetOperators.html#KSPSetOperators">KSPSetOperators</A>(ksp,A,....)
</pre>
<P>
<P>
Developer Note: If <A HREF="../KSP/KSPSetOperators.html#KSPSetOperators">KSPSetOperators</A>() has not been called on the inner <A HREF="../KSP/KSP.html#KSP">KSP</A> then <A HREF="../PC/PCGALERKIN.html#PCGALERKIN">PCGALERKIN</A> could use <A HREF="../Mat/MatRARt.html#MatRARt">MatRARt</A>() or <A HREF="../Mat/MatPtAP.html#MatPtAP">MatPtAP</A>() to compute
the operators automatically.
Should there be a prefix for the inner <A HREF="../KSP/KSP.html#KSP">KSP</A>.
There is no KSPSetFromOptions_Galerkin() that calls <A HREF="../KSP/KSPSetFromOptions.html#KSPSetFromOptions">KSPSetFromOptions</A>() on the inner <A HREF="../KSP/KSP.html#KSP">KSP</A>
<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/PCGalerkinSetRestriction.html#PCGalerkinSetRestriction">PCGalerkinSetRestriction</A>(), <A HREF="../PC/PCGalerkinSetInterpolation.html#PCGalerkinSetInterpolation">PCGalerkinSetInterpolation</A>(), <A HREF="../PC/PCGalerkinGetKSP.html#PCGalerkinGetKSP">PCGalerkinGetKSP</A>()
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/pc/impls/galerkin/galerkin.c.html#PCGALERKIN">src/ksp/pc/impls/galerkin/galerkin.c</A>
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