THANK YOU AGAIN!!!
2011/1/13 Juan Pablo Califano <califa010.flashcod...@gmail.com>:
> PS:
>
> I mentioned that a random sort was not the best approach.
>
> Here's a better way to randomize an array:
>
> public static function shuffle(array:Array):void {
> var tmp:*;
> var cur:int;
> var top:int;
>
> cur = top = array.length;
> if(top) {
> while(--top) {
> cur = Math.floor(Math.random() * (top + 1));
> tmp = array[cur];
> array[cur] = array[top];
> array[top] = tmp;
> }
> }
> }
>
>
> 2011/1/13 Juan Pablo Califano <califa010.flashcod...@gmail.com>
>
>> Try this:
>>
>> function uniqueRandomInt(min:Number, max:Number, n:Number) {
>> var a:Array = [];
>> var i:Number = min;
>> while (a.push(i++)<max);
>> a.sort(function (a:Number, b:Number) {
>> return Math.floor(Math.random()*3)-1;
>>
>> });
>> return a.slice(0,n);
>> }
>>
>> Although a random sort is not the best means to randomize an array, it
>> should work reasonably.
>>
>> The problem with your code was this line:
>>
>> Math.random()*2-1;
>>
>> Your sort function should return 3 diferent values (n < 1, n = 0 and; n >
>> 0) as evenly distributed as possible. Math.random gives you a number that
>> is great or equal to 0 and *less* than 1. It will not give you 1 back
>> (0.999999999, but not 1).
>>
>> So if you do:
>>
>> Math.random() * 2
>>
>> You'll either get 0 or 1 (with decimals); it's not posibble to get 2. You
>> should instead use 3 as the multiplier and floor it; the result should be 0,
>> 1 or 2 (this will have as much randomness as Math.random provides). Now
>> substract 1 and you'll get -1, 0 or 1, which is what you want for your sort
>> function.
>>
>>
>> Cheers
>> Juan Pablo Califano
>> 2011/1/13 natalia Vikhtinskaya <natavi.m...@gmail.com>
>>
>> Hi
>>> I use function that creates unique array
>>>
>>> function uniqueRandomInt(min:Number, max:Number, n:Number) {
>>> var a:Array = [];
>>> var i:Number = min;
>>> while (a.push(i++)<max) {
>>> ;
>>> }
>>> a.sort(function (a:Number, b:Number) { return
>>> Math.random()*2-1;});
>>> return a.slice(0, n);
>>> }
>>>
>>> It works fine for AS2. But for AS3 it gives always the same result
>>> if I ask
>>> uniqueRandomInt(1, 6, 6); I always get 4,2,3,1,5,6
>>>
>>> What is wrong in this code for AS3?
>>>
>>> Thank you in andvance.
>>> _______________________________________________
>>> Flashcoders mailing list
>>> Flashcoders@chattyfig.figleaf.com
>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>>>
>>
>>
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