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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="KSPCGS"><H1>KSPCGS</H1></A>
This code implements the CGS (Conjugate Gradient Squared) method.
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<DT><B>see <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>()</B> -
<br>
<P>
<H3><FONT COLOR="#CC3333">References</FONT></H3>
<DT><B>1. </B> -Sonneveld, 1989.
<br>
<P>
Notes: Does not require a symmetric matrix. Does not apply transpose of the matrix.
Supports left and right preconditioning, but not symmetric.
<P>
Developer Notes: Has this weird support for doing the convergence test with the natural norm, I assume this works only with
no preconditioning and symmetric positive definite operator.
<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/KSPBCGS.html#KSPBCGS">KSPBCGS</A>, <A HREF="../KSP/KSPSetPCSide.html#KSPSetPCSide">KSPSetPCSide</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/cgs/cgs.c.html#KSPCGS">src/ksp/ksp/impls/cgs/cgs.c</A>
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