Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
PeterBurbery`Combinatorics`
PermutationAscents |
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Details and Options
Examples
(2)
Basic Examples
(1)
Consider the permutation:
In[1]:=
p={2,8,1,5,4,7,6,3,9};
Its ascents are at the indices 1, 3, 5, 8, corresponding to , , , :
2<8
1<5
4<7
3<9
In[2]:=
 | PermutationAscents |
Out[2]=
{1,3,5,8}
The descents follow easily:
In[3]:=
ReverseLength@p-
@Reverse@p
| PermutationAscents |
Out[3]=
{2,4,6,7}
Possible Issues
(1)
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