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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="KSPBCGSLSetEll"><H1>KSPBCGSLSetEll</H1></A>
Sets the number of search directions in BiCGStab(L).
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode KSPBCGSLSetEll(KSP ksp, PetscInt ell)
</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>ell </B></TD><TD>- number of search directions
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<P>
<DT><B>-ksp_bcgsl_ell ell</B> -
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
For large ell it is common for the polynomial update problem to become singular (due to happy breakdown for smallish
test problems, but also for larger problems). Consequently, by default, the system is solved by pseudoinverse, which
allows the iteration to complete successfully. See <A HREF="../KSP/KSPBCGSLSetUsePseudoinverse.html#KSPBCGSLSetUsePseudoinverse">KSPBCGSLSetUsePseudoinverse</A>() to switch to a conventional solve.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../KSP/KSP.html#KSP">KSP</A>, BiCGStab(L), set, exact residuals,
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPBCGSLSetUsePseudoinverse.html#KSPBCGSLSetUsePseudoinverse">KSPBCGSLSetUsePseudoinverse</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/impls/bcgsl/bcgsl.c.html#KSPBCGSLSetEll">src/ksp/ksp/impls/bcgsl/bcgsl.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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