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<H1>QEPCompareEigenvalues</H1>
Compares two (possibly complex) eigenvalues according to a certain criterion.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcqep.h"
PetscErrorCode QEPCompareEigenvalues(QEP qep,PetscScalar ar,PetscScalar ai,PetscScalar br,PetscScalar bi,PetscInt *result)
</PRE>
Not 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>qep </B></TD><TD> - the quadratic eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ar </B></TD><TD> - real part of the 1st eigenvalue
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ai </B></TD><TD> - imaginary part of the 1st eigenvalue
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>br </B></TD><TD> - real part of the 2nd eigenvalue
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>bi </B></TD><TD> - imaginary part of the 2nd eigenvalue
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Output Parameter</FONT></H3>
<DT><B>res </B> - result of comparison
<br>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Returns an integer less than, equal to, or greater than zero if the first
eigenvalue is considered to be respectively less than, equal to, or greater
than the second one.
<P>
The criterion of comparison is related to the 'which' parameter set with
<A HREF="../QEP/QEPSetWhichEigenpairs.html#QEPSetWhichEigenpairs">QEPSetWhichEigenpairs</A>().
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../QEP/QEPSortEigenvalues.html#QEPSortEigenvalues">QEPSortEigenvalues</A>(), <A HREF="../QEP/QEPSetWhichEigenpairs.html#QEPSetWhichEigenpairs">QEPSetWhichEigenpairs</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/qep/interface/qepsolve.c.html#QEPCompareEigenvalues">src/qep/interface/qepsolve.c</A>
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