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Index › Programming Questions & Help › Programs › list of random numbers
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list of random numbers (Read 583 times)
brenin
list of random numbers
May 28th, 2008, 4:41pm  
In a program I'm writing, I need a function that creates a list of random numbers (from 0 to a number), and I don't know how to do it in processing.

Ex.:
int list = new int[num];
void createList( int num ) {
...
}

This function would create a list of numbers from 1 to num, in a randomic order:

void createList (6) --> the variable list would receive {0,1,2,5,4,3} or  {3,5,2,0,1,4}, something like that (I don't want repeated numbers)

It would be better if the list is an array, but it can be other structures, that's not a big deal.

It would be really helpful if someone could give some way to go.

Thanks for the help.
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antiplastik
Re: list of random numbers
Reply #1 - May 28th, 2008, 5:09pm  
Here is some code using Java Collections and the shuffle method :

Code:
int n = 10;
Integer[] myArray= new Integer[n];
for (int i = 0; i < myArray.length; i++) myArray[i] = new Integer(i);
java.util.Collections.shuffle(java.util.Arrays.asList(myArray));
println(myArray);


Be careful, myArray contains Integers, not ints (you can use the intValue() method to get the int from an Integer instance).
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brenin
Re: list of random numbers
Reply #2 - May 28th, 2008, 5:21pm  
Thanks for the answer... =)

It worked just fine... that's exactly what I need

Thanks again.
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« Last Edit: May 28th, 2008, 9:42pm by brenin »  
 
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