WeakMajorIndex on IntegerComposition
The sum of the positions i with c(i) >= c(i+1).
Reads the composition as a word, so it stands on a bare list too.
Called as CombinatorialStat(x, "WeakMajorIndex"). The head's page has its examples.
Live
Distribution
Over IntegerCompositions at each size, tallied here in your browser; sizes past 6 are not offered.
Also on
The same name on other carriers, each its own implementation: BinaryWord.
FindStat St001931
The weak major index of an integer composition regarded as a word.
| Object | Value |
|---|---|
[1] | 0 |
[2] | 0 |
[3] | 0 |
[4] | 0 |
[5] | 0 |
[6] | 0 |
[7] | 0 |
[8] | 0 |
Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St001931 has the rest.