math:percentile except each item in
the sequence is repeated cts:frequency times before calculating
the percentiles(s). The function returns the empty sequence if either $arg
or $p is the empty sequence.
This function is designed to take a sequence of values returned
by a lexicon function (for example, cts:element-values); if you
input non-lexicon values, the result will be the empty sequence.
// This query assumes an element range index of type 'int'
// is configured for the 'int' element in the database. It
// generates some sample data and then performs the aggregation
// in a separate transaction.
declareUpdate();
for (x=1; x < 11; x++) {
var obj = new Object();
for (y=0; y < x; y++){
{obj.int = y}; };
xdmp.documentInsert(fn.concat(x, ".json"), obj);}
// After creating the above document, run the following:
//
cts.percentile(
cts.values([cts.jsonPropertyReference("int", ["type=int"])]),
[0.25,0.5,0.75])
=>
1.5
4.5
7.5