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rotate

Shift the items of a list to the left or right

Syntax: x rotate y, rotate[x;y]

Where

  • x is an integer atom
  • y is a list

returns y rotated by x items. Rotation is to the ‘left’ for positive x, to the ‘right’ for negative x.

q)2 rotate 2 3 5 7 11    / rotate a list
5 7 11 2 3
q)-2 rotate 2 3 5 7 11
7 11 2 3 5
q)t:([]a:1 2 3;b:"xyz")
q)1 rotate t             / rotate a table
a b
---
2 y
3 z
1 x
q)0 1 -1 rotate' 3 4#til 12
0  1 2 3
5  6 7 4
11 8 9 10

rotate is a uniform function.

reverse