isIndexedSeries

isIndexedSeries(X)

X is a matrix with only 1 column.

Determine if X is an indexed series.

s=matrix(1..10).rename!(2020.01.01..2020.01.10, );

isIndexedSeries(s);
// output
false

s.setIndexedSeries!()
isIndexedSeries(s);
// output
true