Sorting of data
[this page | pdf]
A very common mathematical task is that of sorting of data.
For example, any list that is put into alphabetical order has been sorted in a
particular manner.
Sorting of real valued arrays is also common within the
financial community. For example, whenever someone wishes to calculate a
quantile, or percentile,
or some other ‘order’ statistic then somewhere within the computer algorithm
used will be some means of sorting the data, i.e. taking an original series 
and
identifying a new series, containing the same values but now sorted, say, as 
where
.
The Nematrian website provides a number of tools for sorting
different types of data, see Sorting Functions.