One-argument form See also two-argument form Match
Depth is used to indicate the level of nesting. For a simple scalar, depth is 0. For other arrays, the depth of the array is 1+ the depth of the item of maximum depth in the array.
¦4 (Depth of a scalar is 0) 0 ¦¼4 (Depth of a vector is 1) 1 ¦2 2½¼6 (Depth of a matrix is 1) 1 ¦'ABC' 1 2 3 (23 55) (Maximum depth is 1+ depth of a vector) 2 'ABC' (2 4½('ABC' 2 3 'K')) ABC ABC 2 3 K (Maximum depth object within the array is ABC 2 3 K 2 - a matrix) ¦'ABC' (2 4½('ABC' 2 3 'K')) 3 (Overall depth is thus 3)
See also ½ (shape) to enquire about the shape of an array.