Hello, I have a problem, I need to extract 10 different random numbers from 1 to 20. Ok, it seems simple, but I can't get 10 different numbers; I need an extraction like: 1 - 3 - 4 - 7 - 8 -12 -15 - 16 - 17 - 18 but my script goes in forever loop: Code: random/seed now extrac: copy [] ;extraction counter: 0 until [ counter: counter + 1 verify: true clear extrac extrac: head extrac loop 10 [ insert extrac random 20 ] sort extrac forall extrac [ if (index? extrac) = 10 [break] if (( first extrac ) = ( second extrac)) [ verify: false ] ] print remold ["Tentative number:" counter] verify ] print extrac 1-20 it's a very close range and PC has troubles to get 10 different numbers...
OK, I found another way: Code: random/seed now a: copy [] until [ b: random 20 check: true foreach temp a [ if temp = b [ check: false] ] if check = true [ append a b ] (length? a) = 10 ] print a What do you think?
No need to do 'foreach You can do something like this (untested) Code: if not check: find a b [ append a b ]
Max, it's just another 1 liner for us REBOLers a: copy/part random [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20] 10
Oops, actually 2 lines, since we need random/seed now ... but, of course we can just do: random/seed now a: copy/part random [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20] 10 (DO NOT use this line in production code, or you will get some duplicates. Put random/seed now on a separate line, and run the previous example multiple times, when needed).
