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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>NEPSLPSetDeflationThreshold</H1>
Sets the threshold value used to switch between deflated and non-deflated iteration.
<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/NEPSLPSetDeflationThreshold.html#NEPSLPSetDeflationThreshold">NEPSLPSetDeflationThreshold</A>(<A HREF="../NEP/NEP.html#NEP">NEP</A> nep,<A HREF="https://petsc.org/release/manualpages/Sys/PetscReal.html#PetscReal">PetscReal</A> deftol)
</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> - nonlinear eigenvalue solver
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>deftol </B></TD><TD> - the threshold value
</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_slp_deflation_threshold <deftol> </B></TD><TD> - set the threshold
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Normally, the solver iterates on the extended problem in order to deflate
previously converged eigenpairs. If this threshold is set to a nonzero value,
then once the residual error is below this threshold the solver will
continue the iteration without deflation. The intention is to be able to
improve the current eigenpair further, despite having previous eigenpairs
with somewhat bad precision.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../NEP/NEPSLPGetDeflationThreshold.html#NEPSLPGetDeflationThreshold">NEPSLPGetDeflationThreshold</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/impls/slp/slp.c.html#NEPSLPSetDeflationThreshold">src/nep/impls/slp/slp.c</A>
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