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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PCEisenstatNoDiagonalScaling"><H1>PCEisenstatNoDiagonalScaling</H1></A>
Causes the Eisenstat preconditioner not to do additional diagonal preconditioning. For matrices with a constant along the diagonal, this may save a small amount of work.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h"
PetscErrorCode PCEisenstatNoDiagonalScaling(PC pc)
</PRE>
Logically Collective on <A HREF="../PC/PC.html#PC">PC</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>pc </B> -the preconditioner context
<br>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<DT><B>-pc_eisenstat_no_diagonal_scaling </B> -Activates <A HREF="../PC/PCEisenstatNoDiagonalScaling.html#PCEisenstatNoDiagonalScaling">PCEisenstatNoDiagonalScaling</A>()
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
If you use the KPSSetDiagonalScaling() or -ksp_diagonal_scale option then you will
likley want to use this routine since it will save you some unneeded flops.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>, Eisenstat, use, diagonal, scaling, SSOR
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCEisenstatSetOmega.html#PCEisenstatSetOmega">PCEisenstatSetOmega</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/eisens/eisen.c.html#PCEisenstatNoDiagonalScaling">src/ksp/pc/impls/eisens/eisen.c</A>
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