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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="KSP_GMRES_CGS_REFINE_IFNEEDED"><H1>KSP_GMRES_CGS_REFINE_IFNEEDED</H1></A>
Do the classical (unmodified) Gram-Schmidt process and one step of iterative refinement if an estimate of the orthogonality of the resulting vectors indicates poor orthogonality.
<P>
Note: This is slower than <A HREF="../KSP/KSP_GMRES_CGS_REFINE_NEVER.html#KSP_GMRES_CGS_REFINE_NEVER">KSP_GMRES_CGS_REFINE_NEVER</A> because it requires an extra norm computation to
estimate the orthogonality but is more stable.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPGMRESClassicalGramSchmidtOrthogonalization.html#KSPGMRESClassicalGramSchmidtOrthogonalization">KSPGMRESClassicalGramSchmidtOrthogonalization</A>(), <A HREF="../KSP/KSPGMRESSetOrthogonalization.html#KSPGMRESSetOrthogonalization">KSPGMRESSetOrthogonalization</A>(), <A HREF="../KSP/KSPGMRESGetOrthogonalization.html#KSPGMRESGetOrthogonalization">KSPGMRESGetOrthogonalization</A>(),
<BR><A HREF="../KSP/KSPGMRESSetCGSRefinementType.html#KSPGMRESSetCGSRefinementType">KSPGMRESSetCGSRefinementType</A>(), <A HREF="../KSP/KSPGMRESGetCGSRefinementType.html#KSPGMRESGetCGSRefinementType">KSPGMRESGetCGSRefinementType</A>(), <A HREF="../KSP/KSP_GMRES_CGS_REFINE_NEVER.html#KSP_GMRES_CGS_REFINE_NEVER">KSP_GMRES_CGS_REFINE_NEVER</A>, KSP_GMRES_CGS_REFINE_ALWAYS,
<A HREF="../KSP/KSPGMRESModifiedGramSchmidtOrthogonalization.html#KSPGMRESModifiedGramSchmidtOrthogonalization">KSPGMRESModifiedGramSchmidtOrthogonalization</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/../../../include/petscksp.h.html#KSP_GMRES_CGS_REFINE_IFNEEDED">src/ksp/ksp/../../../include/petscksp.h</A>
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