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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>SVDTRLanczosSetRestart</H1>
Sets the restart parameter for the thick-restart Lanczos method, in particular the proportion of basis vectors that must be kept after restart.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcsvd.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../SVD/SVDTRLanczosSetRestart.html#SVDTRLanczosSetRestart">SVDTRLanczosSetRestart</A>(<A HREF="../SVD/SVD.html#SVD">SVD</A> svd,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> keep)
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#883300">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>svd </B></TD><TD> - the singular value solver
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>keep </B></TD><TD> - the number of vectors to be kept at restart
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Options Database Key</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-svd_trlanczos_restart </B></TD><TD> - Sets the restart parameter
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Allowed values are in the range [0.1,0.9]. The default is 0.5.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../SVD/SVDTRLanczosGetRestart.html#SVDTRLanczosGetRestart">SVDTRLanczosGetRestart</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/svd/impls/trlanczos/trlanczos.c.html#SVDTRLanczosSetRestart">src/svd/impls/trlanczos/trlanczos.c</A>
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