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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="KSPTFQMR"><H1>KSPTFQMR</H1></A>
A transpose free QMR (quasi minimal residual),
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<DT><B>see <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>()</B> -
<br>
<P>
Notes: Supports left and right preconditioning, but not symmetric
<P>
The "residual norm" computed in this algorithm is actually just an upper bound on the actual residual norm.
That is for left preconditioning it is a bound on the preconditioned residual and for right preconditioning
it is a bound on the true residual.
<P>
References: Freund, 1993
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>(), <A HREF="../KSP/KSPSetType.html#KSPSetType">KSPSetType</A>(), <A HREF="../KSP/KSPType.html#KSPType">KSPType</A> (for list of available types), <A HREF="../KSP/KSP.html#KSP">KSP</A>, <A HREF="../KSP/KSPTCQMR.html#KSPTCQMR">KSPTCQMR</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/impls/tfqmr/tfqmr.c.html#KSPTFQMR">src/ksp/ksp/impls/tfqmr/tfqmr.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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