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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="ISSortPermutation"><H1>ISSortPermutation</H1></A>
calculate the permutation of the indices into a nondecreasing order.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscis.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../IS/ISSortPermutation.html#ISSortPermutation">ISSortPermutation</A>(<A HREF="../IS/IS.html#IS">IS</A> f,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> always,<A HREF="../IS/IS.html#IS">IS</A> *h)
</PRE>
Not collective.
<P>
<H3><FONT COLOR="#CC3333">Input arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD>- <A HREF="../IS/IS.html#IS">IS</A> to sort
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>always </B></TD><TD>- build the permutation even when f's indices are nondecreasing.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output argument</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>h </B></TD><TD>- permutation or NULL, if f is nondecreasing and always == <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>.
</TD></TR></TABLE>
<P>
<P>
Note: Indices in f are unchanged. f[h[i]] is the i-th smallest f index.
If always == <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>, an extra check is peformed to see whether
the f indices are nondecreasing. h is built on <A HREF="../Sys/PETSC_COMM_SELF.html#PETSC_COMM_SELF">PETSC_COMM_SELF</A>, since
the permutation has a local meaning only.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../IS/ISLocalToGlobalMapping.html#ISLocalToGlobalMapping">ISLocalToGlobalMapping</A>, <A HREF="../IS/ISSort.html#ISSort">ISSort</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/vec/is/is/utils/isdiff.c.html#ISSortPermutation">src/vec/is/is/utils/isdiff.c</A>
<BR><A HREF="./index.html">Index of all IS routines</A>
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