x is a numeric list returns its median.
q)med 10 34 23 123 5 56 28.5 q)select med price by sym from trade where date=2001.10.10,sym in`AAPL`LEH
med is an aggregate function.
Partitions and segments
In V3.0 upwards
med signals a rank error when running a median over partitions, or segments. This is deliberate, as previously
med was returning median of medians for such cases. This should now be explicitly coded as a cascading select.
q)select med price by sym from select price, sym from trade where date=2001.10.10, sym in `AAPL`LEH