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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/DM/PetscDTPermIndex.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscDTPermIndex"><H1>PetscDTPermIndex</H1></A>
Encode a permutation of n into an integer in [0, n!). This inverts <A HREF="../FE/PetscDTEnumPerm.html#PetscDTEnumPerm">PetscDTEnumPerm</A>.
<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>n </B></TD><TD>- a non-negative integer (see note about limits below)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>perm </B></TD><TD>- the permuted list of the integers [0, ..., n-1]
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>k </B></TD><TD>- an integer in [0, n!)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>isOdd </B></TD><TD>- if not NULL, returns wether the permutation used an even or odd number of swaps.
</TD></TR></TABLE>
<P>
Note: this is limited to n such that n! can be represented by <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, which is 12 if <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> is a signed 32-bit integer and 20 if <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> is a signed 64-bit integer.
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/dt/../../../include/petscdt.h.html#PetscDTPermIndex">src/dm/dt/../../../include/petscdt.h</A>
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