Randomize only a part of an array

Programming Questions

231buc

Randomize only a part of an array

in Programming Questions • 8 months ago

Hello everbody,

with help of the forum I've got the following code. But I would like to randomize only a part of the array. E.g. "radomarray[0-4]". How is that possible?

Thanks in advance.

int[] randomarray = new int[10];
void setup()
{
}
void draw()
{
for(int i=0; i < randomarray.length; i++){
randomarray[i]=i;
}
for (int i=0; i < randomarray.length; i++) {
int temp = randomarray[i];
int x = (int)random(0, randomarray.length);
randomarray[i]=randomarray[x];
randomarray[x]=temp;
}
println(randomarray);
}

Replies(4)

asimes

Re: Randomize only a part of an array

8 months ago

int[] example = new int[10];
void setup() {
size(100, 100);
println("Original:");
for (int i = 0; i < example.length; i++) {
example[i] = i;
print(example[i]+" ");
}
println("\n");
example = swapSome(example, 2, 8);
println("Modified:");
for (int i = 0; i < example.length; i++) print(example[i]+" ");
exit();
}
int[] swapSome(int[] in, int a, int b) {
int range = b-a;
for (int i = a; i < b; i++) {
int randIndex = (int)random(range)+a;
int swap = in[i];
in[i] = in[randIndex];
in[randIndex] = swap;
}
return in;
}

Edit: Control what parts of the array are modified (randomly swapped) with line 13.

231buc

Re: Randomize only a part of an array

8 months ago

thanks for answering. But I think you don't understood, what I meant. I have an movie array with 12 video files. I would like to show everytime 3 of them randomly, when something special happend. E.g. if gender M = true, show randomly videofiles [0-2] one after another, if gender F = true, show randomly videofiles [3-5] one after another. And so on... hope all is clear now? Is that realizable in processing? Or do I have to make an array for each special group of the videos?

Thanks

buc

asimes

Re: Randomize only a part of an array

8 months ago

You should have said that, what I wrote is more related to the code you posted and what you wrote the first time.

If you have elements in an array that are fixed (not swapping) and you want to see some subset of them in a random order then make an ArrayList of that subset. For example, if you want to see 0 - 2 in random order, then make an ArrayList that has elements 0 - 2. Randomize the ArrayList and then remove each element after its associated video is done playing. When the ArrayList is empty, all videos have been played (in some random order).

231buc

Re: Randomize only a part of an array

8 months ago

ok, I will try it. but not yet. ;) Thanks!

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