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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="SNESLineSearchBTSetAlpha"><H1>SNESLineSearchBTSetAlpha</H1></A>
Sets the descent parameter, alpha, in the BT linesearch variant.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESLineSearchBTSetAlpha(SNESLineSearch linesearch, PetscReal alpha)
</PRE>
<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>linesearch </B></TD><TD>- linesearch context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>alpha </B></TD><TD>- The descent parameter
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESLineSearchSetLambda.html#SNESLineSearchSetLambda">SNESLineSearchSetLambda</A>(), <A HREF="../SNES/SNESLineSearchGetTolerances.html#SNESLineSearchGetTolerances">SNESLineSearchGetTolerances</A>() <A HREF="../SNES/SNESLINESEARCHBT.html#SNESLINESEARCHBT">SNESLINESEARCHBT</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/linesearch/impls/bt/linesearchbt.c.html#SNESLineSearchBTSetAlpha">src/snes/linesearch/impls/bt/linesearchbt.c</A>
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