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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>SlepcSortEigenvalues</H1>
Sorts a list of eigenvalues according to the sorting criterion specified in a <A HREF="../sys/SlepcSC.html#SlepcSC">SlepcSC</A> context.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcsys.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../sys/SlepcSortEigenvalues.html#SlepcSortEigenvalues">SlepcSortEigenvalues</A>(<A HREF="../sys/SlepcSC.html#SlepcSC">SlepcSC</A> sc,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> n,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *eigr,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *eigi,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> *perm)
</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>sc </B></TD><TD> - the sorting criterion context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD> - number of eigenvalues in the list
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eigr </B></TD><TD> - pointer to the array containing the eigenvalues
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eigi </B></TD><TD> - imaginary part of the eigenvalues (only when using real numbers)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>perm </B></TD><TD> - permutation array. Must be initialized to 0:n-1 on input.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Note</FONT></H3>
The result is a list of indices in the original eigenvalue array
corresponding to the first n eigenvalues sorted in the specified
criterion.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../sys/SlepcSCCompare.html#SlepcSCCompare">SlepcSCCompare</A>(), <A HREF="../sys/SlepcSC.html#SlepcSC">SlepcSC</A>
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/sys/slepcsc.c.html#SlepcSortEigenvalues">src/sys/slepcsc.c</A>
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