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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/DUALSPACE/PetscDTEnumSubset.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscDTEnumSubset"><H1>PetscDTEnumSubset</H1></A>
Split the integers [0, ..., n - 1] into two complementary ordered subsets, the first subset of size k and being the jth subset of that size in lexicographic order.
<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>k </B></TD><TD>- an integer in [0, n]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>j </B></TD><TD>- an index in [0, n choose k)
</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>perm </B></TD><TD>- the jth subset of size k of the integers [0, ..., n - 1], followed by its complementary set.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>isOdd </B></TD><TD>- if not NULL, return whether perm is an even or odd permutation.
</TD></TR></TABLE>
<P>
Note: this is limited by arguments such that n choose k can be represented by <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../FE/PetscDTEnumSubset.html#PetscDTEnumSubset">PetscDTEnumSubset</A>(), <A HREF="../FE/PetscDTSubsetIndex.html#PetscDTSubsetIndex">PetscDTSubsetIndex</A>()
<BR><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/dualspace/../../../../include/petscdt.h.html#PetscDTEnumSubset">src/dm/dt/dualspace/../../../../include/petscdt.h</A>
<BR><A HREF="./index.html">Index of all DUALSPACE routines</A>
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