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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>NEPSetTwoSided</H1>
Sets the solver to use a two-sided variant so that left eigenvectors are also computed.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcnep.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../NEP/NEPSetTwoSided.html#NEPSetTwoSided">NEPSetTwoSided</A>(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscBool.html#PetscBool">PetscBool</A> twosided)
</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>nep </B></TD><TD> - the eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>twosided </B></TD><TD> - whether the two-sided variant is to be used or not
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-nep_two_sided <boolean> </B></TD><TD> - Sets/resets the twosided flag
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
If the user sets twosided=<A HREF="https://petsc.org/release/manualpages/Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> then the solver uses a variant of
the algorithm that computes both right and left eigenvectors. This is
usually much more costly. This option is not available in all solvers.
<P>
When using two-sided solvers, the problem matrices must have both the
<A HREF="https://petsc.org/release/manualpages/Mat/MatMult.html#MatMult">MatMult</A> and <A HREF="https://petsc.org/release/manualpages/Mat/MatMultTranspose.html#MatMultTranspose">MatMultTranspose</A> operations defined.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../NEP/NEPGetTwoSided.html#NEPGetTwoSided">NEPGetTwoSided</A>(), <A HREF="../NEP/NEPGetLeftEigenvector.html#NEPGetLeftEigenvector">NEPGetLeftEigenvector</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/nep/interface/nepopts.c.html#NEPSetTwoSided">src/nep/interface/nepopts.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/nep/tutorials/ex42.c.html">src/nep/tutorials/ex42.c</A><BR>
<BR><BR><A HREF="./index.html">Index of all NEP routines</A>
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