subarray(a, i, j)
Returns an array with entries a[i], a[i+1],...a[j].
subarray(a, i)
Returns an array with entries a[i], a[i+1],... until the end of array a.
See also join apply reverse
Example
a = ( -1, -2, -3, -4 )
-1 -2 -3 -4
b = subarray( a, 2, 3 )
-2 -3