making random not repeat

[sukiho]

Hi, I have some actionscript here, Im wanting to change the variable numSound. At the moment it is a random number 1-5 which works well but I dont want repetition. Tried all sorts of things but no luck. Any help appreciated.

private function randRange(min:Number, max:Number):Number
	{
    	var randomNum:Number = Math.floor(Math.random() * (max - min + 1)) + min;
    	
    	return randomNum;
	}
	
	/**
	 * selected random sound 
	 */
	public function playHelpSound():Void
	{
		trace("playHelpSound active: " + active);
		
		if (active)
		{
			var numSound:Number = randRange(1, 5);
		
			var urlSound:String = XPathAPI.selectSingleNode(_xmlTeacherSounds.firstChild, 'teacher/study/sound[@sndnum="st' + numSound + '"]').attributes['sndurl'];

[vinayak.kadam]

You have two options:

1st Option: When you generate a random no, push it in some array and later when you generate 2nd random no, check it with the previous nos to be sure that it is not repeated.

2nd Option: Generate and array having nos in a random no within the range of 1 to 5. Use array nos sequentially so as to never repeat the number.

[sukiho]

thanks, thats a bit beyond me. I have tried code like this but I dont know how to get the number out of it

var arrayToRandom:Array = new Array();
             var qRequired:Number = 5;
 
             // Inserts Numbers in Array
             for(var i:Number = 1; i<=qRequired; i++)
             {
	              arrayToRandom.push( i );
                }
 
                   // Outputs numbers non-repeated
                  for(var k:Number = 1; k<=qRequired; k++)
                 {
	              // Search for value inside the Array in a random position
	                 var randomPos:Number = Math.floor( Math.random() * arrayToRandom.length );
 
	                // Selects value and removes it from Array
	              var valueFromArray = arrayToRandom.splice(randomPos, 1);
 
	              // Converts value in number
	               var numberRand = parseInt(valueFromArray);
 
	               trace(numberRand);
}

[vinayak.kadam]

Use this code to randomize an array:

arrayToRandom = [1,2,3,4,5]; // array of numbers

arrayToRandom.sort(function(){return Math.floor(Math.random()*3)-1}); // randomise the array 

trace(arrayToRandom); 

last trace will show you that the array 'arrayToRandom' will have numbers in the range of 1 to 5 in random order.

[silentweed]

var arrayToRandom:Array = new Array();
var qRequired:Number = 5;
 
             // Inserts Numbers in Array
for(var i:Number = 1; i<=qRequired; i++)
{
	 arrayToRandom.push( i );
}
 
// Outputs numbers non-repeated
for(var k:Number = 1; k<=qRequired; k++)
{

	var randomPos:Number = random(arrayToRandom.length);
	randomNumber = arrayToRandom[randomPos];
	arrayToRandom.splice(randomPos, 1);
	trace(randomNumber); 
}

[sukiho]

if I replace

var numSound:Number = randRange(1, 5);

with your code or any of the others I have tried I get random numbers but they repeat

maybe I need to put it earlier in the code?

[Robb@exo]

Came across this link recently from another post. Check out the "Array randomise" section which incorporates non-repetitive values.
http://www.jackleaman.co.uk/flash_db...nscriptV8.html