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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>PEPSTOARSetDetectZeros</H1>
Sets a flag to enforce detection of zeros during the factorizations throughout the spectrum slicing computation.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcpep.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PEP/PEPSTOARSetDetectZeros.html#PEPSTOARSetDetectZeros">PEPSTOARSetDetectZeros</A>(<A HREF="../PEP/PEP.html#PEP">PEP</A> pep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscBool.html#PetscBool">PetscBool</A> detect)
</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>pep </B></TD><TD> - the eigenproblem solver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>detect </B></TD><TD> - check for zeros
</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>-pep_stoar_detect_zeros </B></TD><TD> - Check for zeros; this takes an optional
bool value (0/1/no/yes/true/false)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
A zero in the factorization indicates that a shift coincides with an eigenvalue.
<P>
This flag is turned off by default, and may be necessary in some cases.
This feature currently requires an external package for factorizations
with support for zero detection, e.g. MUMPS.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../PEP/PEPSetInterval.html#PEPSetInterval">PEPSetInterval</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/pep/impls/krylov/stoar/stoar.c.html#PEPSTOARSetDetectZeros">src/pep/impls/krylov/stoar/stoar.c</A>
<P><H3><FONT COLOR="#883300">Examples</FONT></H3>
<A HREF="../../../src/pep/tutorials/ex38.c.html">src/pep/tutorials/ex38.c</A><BR>
<BR><BR><A HREF="./index.html">Index of all PEP routines</A>
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