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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>SVDTRLanczosSetOneSide</H1>
Indicate if the variant of the Lanczos method to be used is one-sided or two-sided.
<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/SVDTRLanczosSetOneSide.html#SVDTRLanczosSetOneSide">SVDTRLanczosSetOneSide</A>(<A HREF="../SVD/SVD.html#SVD">SVD</A> svd,<A HREF="https://petsc.org/release/manualpages/Sys/PetscBool.html#PetscBool">PetscBool</A> oneside)
</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> - singular value solver
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>oneside </B></TD><TD> - boolean flag indicating if the method is one-sided or not
</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_oneside <boolean> </B></TD><TD> - Indicates the boolean flag
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
By default, a two-sided variant is selected, which is sometimes slightly
more robust. However, the one-sided variant is faster because it avoids
the orthogonalization associated to left singular vectors.
<P>
One-sided orthogonalization is also available for the GSVD, in which case
two orthogonalizations out of three are avoided.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../SVD/SVDLanczosSetOneSide.html#SVDLanczosSetOneSide">SVDLanczosSetOneSide</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#SVDTRLanczosSetOneSide">src/svd/impls/trlanczos/trlanczos.c</A>
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