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<div id="version" align=right><b>slepc-3.22.2 2024-12-02</b></div>
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<H1>EPSSetExtraction</H1>
Specifies the type of extraction technique to be employed by the eigensolver.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepceps.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../EPS/EPSSetExtraction.html#EPSSetExtraction">EPSSetExtraction</A>(<A HREF="../EPS/EPS.html#EPS">EPS</A> eps,<A HREF="../EPS/EPSExtraction.html#EPSExtraction">EPSExtraction</A> extr)
</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>eps </B></TD><TD> - the eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>extr </B></TD><TD> - a known type of extraction
</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>-eps_ritz </B></TD><TD> - Rayleigh-Ritz extraction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_harmonic </B></TD><TD> - harmonic Ritz extraction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_harmonic_relative </B></TD><TD> - harmonic Ritz extraction relative to the eigenvalue
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_harmonic_right </B></TD><TD> - harmonic Ritz extraction for rightmost eigenvalues
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_harmonic_largest </B></TD><TD> - harmonic Ritz extraction for largest magnitude
(without target)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_refined </B></TD><TD> - refined Ritz extraction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-eps_refined_harmonic </B></TD><TD> - refined harmonic Ritz extraction
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Not all eigensolvers support all types of extraction. See the SLEPc
Users Manual for details.
<P>
By default, a standard Rayleigh-Ritz extraction is used. Other extractions
may be useful when computing interior eigenvalues.
<P>
Harmonic-type extractions are used in combination with a 'target'.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSSetTarget.html#EPSSetTarget">EPSSetTarget</A>(), <A HREF="../EPS/EPSGetExtraction.html#EPSGetExtraction">EPSGetExtraction</A>(), <A HREF="../EPS/EPSExtraction.html#EPSExtraction">EPSExtraction</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/eps/interface/epsopts.c.html#EPSSetExtraction">src/eps/interface/epsopts.c</A>
<BR><BR><A HREF="./index.html">Index of all EPS routines</A>
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