Y may be any array. R is a non-negative integer vector whose elements are the dimensions of Y. If Y is a scalar, then R is an empty vector. The rank of Y is given by ⍴⍴Y.
⍴10
⍴'CAT'
3
⍴3 4⍴⍳12
3 4
+G←(2 3⍴⍳6)('CAT' 'MOUSE' 'FLEA')
1 2 3 CAT MOUSE FLEA
4 5 6
⍴G
2
⍴⍴G
1
⍴¨G
2 3 3
⍴¨¨G
3 5 4