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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="PCSetDiagonalScale"><H1>PCSetDiagonalScale</H1></A>
Indicates the left scaling to use to apply an additional left and right scaling as needed by certain time-stepping codes.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PCSetDiagonalScale(PC pc,Vec s)
</PRE>
Logically Collective on <A HREF="../PC/PC.html#PC">PC</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pc </B></TD><TD>- the preconditioner context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>s </B></TD><TD>- scaling vector
</TD></TR></TABLE>
<P>
<P>
Notes: The system solved via the Krylov method is
<pre>
D M A D^{-1} y = D M b for left preconditioning or
</pre>
<pre>
D A M D^{-1} z = D b for right preconditioning
</pre>
<P>
<A HREF="../PC/PCDiagonalScaleLeft.html#PCDiagonalScaleLeft">PCDiagonalScaleLeft</A>() scales a vector by D. <A HREF="../PC/PCDiagonalScaleRight.html#PCDiagonalScaleRight">PCDiagonalScaleRight</A>() scales a vector by D^{-1}.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCCreate.html#PCCreate">PCCreate</A>(), <A HREF="../PC/PCSetUp.html#PCSetUp">PCSetUp</A>(), <A HREF="../PC/PCDiagonalScaleLeft.html#PCDiagonalScaleLeft">PCDiagonalScaleLeft</A>(), <A HREF="../PC/PCDiagonalScaleRight.html#PCDiagonalScaleRight">PCDiagonalScaleRight</A>(), <A HREF="../PC/PCGetDiagonalScale.html#PCGetDiagonalScale">PCGetDiagonalScale</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/interface/precon.c.html#PCSetDiagonalScale">src/ksp/pc/interface/precon.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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