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<div id="version" align=right><b>slepc-3.22.2 2024-12-02</b></div>
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<H1>PEPCISSSetExtraction</H1>
Sets the extraction technique used in the CISS solver.
<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/PEPCISSSetExtraction.html#PEPCISSSetExtraction">PEPCISSSetExtraction</A>(<A HREF="../PEP/PEP.html#PEP">PEP</A> pep,<A HREF="../PEP/PEPCISSExtraction.html#PEPCISSExtraction">PEPCISSExtraction</A> extraction)
</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 polynomial eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>extraction </B></TD><TD> - the extraction technique
</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_ciss_extraction </B></TD><TD> - Sets the extraction technique (either 'ritz', 'hankel' or 'caa')
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
By default, the Rayleigh-Ritz extraction is used (<A HREF="../PEP/PEPCISSExtraction.html#PEPCISSExtraction">PEP_CISS_EXTRACTION_RITZ</A>).
<P>
If the 'hankel' or the 'caa' option is specified (<A HREF="../PEP/PEPCISSExtraction.html#PEPCISSExtraction">PEP_CISS_EXTRACTION_HANKEL</A> or
<A HREF="../PEP/PEPCISSExtraction.html#PEPCISSExtraction">PEP_CISS_EXTRACTION_CAA</A>), then the Block Hankel method, or the Communication-avoiding
Arnoldi method, respectively, is used for extracting eigenpairs.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../PEP/PEPCISSGetExtraction.html#PEPCISSGetExtraction">PEPCISSGetExtraction</A>(), <A HREF="../PEP/PEPCISSExtraction.html#PEPCISSExtraction">PEPCISSExtraction</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/ciss/pciss.c.html#PEPCISSSetExtraction">src/pep/impls/ciss/pciss.c</A>
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