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<TITLE>KSPUnwindPreconditioner</TITLE>
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<A NAME="KSPUnwindPreconditioner"><H1>KSPUnwindPreconditioner</H1></A>
Unwinds the preconditioning in the solution. That is, takes solution to the preconditioned problem and gets the solution to the original problem from it.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PETSCKSP_DLLEXPORT KSPUnwindPreconditioner(KSP ksp,Vec vsoln,Vec vt1)
</PRE>
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
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vsoln </B></TD><TD>- solution vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vt1 </B></TD><TD>- temporary work vector
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>vsoln </B> -contains solution on output
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
If preconditioning either symmetrically or on the right, this routine solves
for the correction to the unpreconditioned problem. If preconditioning on
the left, nothing is done.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../KSP/KSP.html#KSP">KSP</A>, unwind, preconditioner
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPSetPreconditionerSide.html#KSPSetPreconditionerSide">KSPSetPreconditionerSide</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/interface/itres.c.html#KSPUnwindPreconditioner">src/ksp/ksp/interface/itres.c</A>
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