Hi,
here an alternative way of producing a random array:
/**
* Randomizes a copy of this array.
*/
public function randomize (pArray:Array):Array {
var newArray:Array = pArray.slice();
var i:Number = newArray.length;
while (i) {
var p:Number = random(i);
var t:Object = newArray[--i];
newArray[i] = newArray[p];
newArray[p] = t;
}
return newArray;
}
regards
JC
On Thu, May 6, 2010 at 3:27 AM, Juan Pablo Califano <
[email protected]> wrote:
> A simple way:
>
> Put all the candidate numbers in a list (in this case, 1 to 40). Then pick
> randomly from that array, one at the time, and make sure you remove that
> number from the candidates list, so you can't have duplicates.
>
> In code (untested):
>
> function getRandomList():Array {
> var min:Number = 1;
> var max:Number = 40;
> var numItems:Number = 10;
> var candidates:Array = [];
> // fill up the candidates list with the "eligible" numbers
> for(var i:Number = min; i <= max; i++) {
> candidates.push(i);
> }
>
> var list:Array = [];
> var idx:Number = 0;
> var selectedNumber:Number = 0;
> for(i = 0; i < numItems; i++) {
> // get a number from the candidates list, randomly. Add it to the
> result and remove it from the candidates list (using splice)
> idx = Math.floor(Math.random() * candidates.length);
> selectedNumber = candidates.splice(idx,1)[0];
> list.push(selectedNumber);
> }
> return list;
> }
>
>
> Cheers
> Juan Pablo Califano
>
> 2010/5/5 Alan Neilsen <[email protected]>
>
> > I am working in ActionScript 2. I want to create a quiz in which 10
> > questions are randomly selected from a block of 40 questions. I found the
> > following code, but I can't work out how to stop it doubling up the
> > questions.
> >
> > function randRange(min:Number, max:Number):Number {
> > var randomNum:Number = Math.floor(Math.random() * (max - min + 1)) +
> > min;
> > return randomNum;
> > }
> > for (var i = 0; i < 10; i++) {
> > var n:Number = randRange(1, 40)
> > trace(n);
> > }
> >
> > When I run this it outputs a list of numbers like 40 13 17 12 27 12
> 3
> > 17 9 15 which means some questions (in this case 17 and 12) will
> appear
> > twice in my quiz.
> > Bearing in mind that I am a bit of an ActionScript dummy, can anybody
> > suggest a way to modify the above script to prevent the same number being
> > generated more than once.
> >
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