Format ⎕FMT
Monadic ⎕FMT means
⎕FMT 2 4⍴⍳8
1 2 3 4
5 6 7 8
Dyadic ⎕FMT means
'I3,F5.2' ⎕FMT 2 4⍴⍳8
1 2.00 3 4.00
5 6.00 7 8.00
⎕FMT means ⎕FMT 2 4⍴⍳8
1 2 3 4
5 6 7 8
⎕FMT means 'I3,F5.2' ⎕FMT 2 4⍴⍳8
1 2.00 3 4.00
5 6.00 7 8.00