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<TITLE>KSPSetInitialGuessNonzero</TITLE>
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<A NAME="KSPSetInitialGuessNonzero"><H1>KSPSetInitialGuessNonzero</H1></A>
Tells the iterative solver that the initial guess is nonzero; otherwise <A HREF="../KSP/KSP.html#KSP">KSP</A> assumes the initial guess is to be zero (and thus zeros it out before solving).
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode KSPSetInitialGuessNonzero(KSP ksp,PetscBool flg)
</PRE>
Logically Collective on <A HREF="../KSP/KSP.html#KSP">KSP</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>ksp </B></TD><TD>- iterative context obtained from <A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flg </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> indicates the guess is non-zero, <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> indicates the guess is zero
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options database keys</FONT></H3>
<DT><B>-ksp_initial_guess_nonzero : use nonzero initial guess; this takes an optional truth value (0/1/no/yes/true/false)</B> -
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
If this is not called the X vector is zeroed in the call to <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>().
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../KSP/KSP.html#KSP">KSP</A>, set, initial guess, nonzero
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPGetInitialGuessNonzero.html#KSPGetInitialGuessNonzero">KSPGetInitialGuessNonzero</A>(), <A HREF="../KSP/KSPSetInitialGuessKnoll.html#KSPSetInitialGuessKnoll">KSPSetInitialGuessKnoll</A>(), <A HREF="../KSP/KSPGetInitialGuessKnoll.html#KSPGetInitialGuessKnoll">KSPGetInitialGuessKnoll</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/interface/itfunc.c.html#KSPSetInitialGuessNonzero">src/ksp/ksp/interface/itfunc.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/pc/examples/tutorials/ex1.c.html">src/ksp/pc/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/ksp/pc/examples/tutorials/ex2.c.html">src/ksp/pc/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex1.c.html">src/ksp/ksp/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex3.c.html">src/ksp/ksp/examples/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex9.c.html">src/ksp/ksp/examples/tutorials/ex9.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex10.c.html">src/ksp/ksp/examples/tutorials/ex10.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex51.c.html">src/ksp/ksp/examples/tutorials/ex51.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex6f.F.html">src/ksp/ksp/examples/tutorials/ex6f.F.html</A><BR>
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