« first day (2641 days earlier)      last day (34 days later) » 

7:04 AM
welcome :) If you like some interactive lecture, I started with this one https://tutorial.dyalog.com/ Especially if you don't haver any programming experience. Otherwise I had much fun at the APL Quest which has at least 24 hours of video solving entry level problems.
https://aplwiki.com/wiki/APL_Quest#Problems_from_2016
 
 
2 hours later…
8:37 AM
yes, the latter, thanks!
@LdBeth never have used ¨ that way. It is each with dyadic operand, as described on the help page
Interesting!
 

« first day (2641 days earlier)      last day (34 days later) »