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<TITLE>PCEISENSTAT</TITLE>
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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="PCEISENSTAT"><H1>PCEISENSTAT</H1></A>
An implementation of SSOR (symmetric successive over relaxation, symmetric Gauss-Seidel) preconditioning that incorporates Eisenstat's trick to reduce the amount of computation needed.
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_eisenstat_omega <omega> </B></TD><TD>- Sets omega
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_eisenstat_no_diagonal_scaling </B></TD><TD>- Activates <A HREF="../PC/PCEisenstatSetNoDiagonalScaling.html#PCEisenstatSetNoDiagonalScaling">PCEisenstatSetNoDiagonalScaling</A>()
</TD></TR></TABLE>
<P>
<P>
<P>
Notes: Only implemented for the SeqAIJ matrix format.
Not a true parallel SOR, in parallel this implementation corresponds to block
Jacobi with SOR on each block.
<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/PCEisenstatSetNoDiagonalScaling.html#PCEisenstatSetNoDiagonalScaling">PCEisenstatSetNoDiagonalScaling</A>(), <A HREF="../PC/PCEisenstatSetOmega.html#PCEisenstatSetOmega">PCEisenstatSetOmega</A>(), <A HREF="../PC/PCSOR.html#PCSOR">PCSOR</A>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/eisens/eisen.c.html#PCEISENSTAT">src/ksp/pc/impls/eisens/eisen.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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