Y may be any non-scalar array.  X must be a simple integer scalar or vector.  K is a vector of zero or more axes of Y.

R is an array of the elements of Y with the first or last X[i] elements removed. Elements are removed from the beginning or end of Y according to the sign of X[i].

The rank of R is the same as the rank of Y:

       ⍴⍴R ←→ ⍴⍴Y

The size of each axis of R is determined by the corresponding element of X:

      (⍴R)[,K] ←→ 0⌈(⍴Y)[,K]-|,X

      ⎕←M←2 3 4⍴⍳24
 1  2  3  4
 5  6  7  8
 9 10 11 12
           
13 14 15 16
17 18 19 20
21 22 23 24
 
      1↓[2]M
 5  6  7  8
 9 10 11 12
           
17 18 19 20
21 22 23 24
 
      2↓[3]M
 3  4
 7  8
11 12
     
15 16
19 20
23 24
 
      2 1↓[3 2]M
 7  8
11 12
     
19 20
23 24