Setting different random values to an array

Programming Questions

Ben Crack..

Setting different random values to an array

in Programming Questions • 1 year ago

I have an array that needs to be filled with 20 different numbers, in random order, from 0 - 19. How would I do this?

It is important that no numbers repeat.

Replies(2)

tfguy44

Re: Setting different random values to an array

1 year ago

Create the array so that it has the numbers 0 to 19 in it in order, and then swap each element in that array with a random other element in the array. This will create an array that contains the numbers 0 to 19 in a random order.

Ben Crack..

Re: Setting different random values to an array

1 year ago

Thanks for the reply. How would I swap the values?

EDIT: Figured it out myself.

void randomizeChromozome() {//this function randomly selects the order of waypoints to follow
for(int i = 0; i < numPoints; i++){
chromosome[i] = i;
}
for(int i = 0; i < numPoints; i++){
int firstNum = int(random(numPoints));
int secondNum = int(random(numPoints));
int firstSelected = chromosome[firstNum];
int secondSelected = chromosome[secondNum];
chromosome[firstNum] = secondSelected;
chromosome[secondNum] = firstSelected;
}
}

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