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Y may be any array. R is the number of levels of nesting of Y. A simple scalar (rank-0 number, character or namespace-reference) has a depth of 0.

A higher rank array, all of whose items are simple scalars, is termed a simple array and has a depth of 1. An array whose items are not all simple scalars is nested and has a depth 1 greater than that of its most deeply nested item.

Y is of uniform depth if it is simple or if all of its items have the same uniform depth.

If ⎕ML<2 and Y is not of uniform depth then R is negated.

If ⎕ML<2, a negative value of R indicates non-uniform depth.

#### Examples

≡1
0
≡'A'
0
≡'ABC'
1
≡1 'A'
1
⎕ML←0
≡A←(1 2)(3 (4 5)) ⍝ Non-uniform array
¯3
≡¨A ⍝ A[1] is uniform, A[2] is non-uniform
1 ¯2
≡¨¨A
0 0 0 1
⎕ML←2
≡A
3
≡¨A
1 2
≡¨¨A
0 0 0 1

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