NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.
Monadic Less Than Sign is not defined
Dyadic Less Than Sign means
1 2 3 < 4 2 ¯1
1 0 0
1 2 3 < 2
1 0 0
NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.
Monadic Less Than Sign is not defined
1 2 3 < 4 2 ¯1
1 0 0
1 2 3 < 2
1 0 0