I'm not familiar with APL, but after seeing the examples from Wikipedia [1], I think I know what you mean:

    # generates a typical set of Pick 6 lottery numbers
    x[⍋x←6?40]
    # finds all prime numbers from 1 to R
    (~R∊R∘.×R)/R←1↓⍳R
    # game of life
    life←{↑1 ⍵∨.∧3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵}

[1] http://en.wikipedia.org/wiki/APL_%28programming_language%29#...