Question

I have the foll0wing code to generate a matrix of 0’s and 1’s using java.util.Random and a 2d array. I was wondering if there is a way to define the probability of the number of 0’s and 1’s occurring per row in the matrix. I want to have an equal probability of generating both 0’s and 1’s.

I want to convert this matlab equivalent code to generate a matrix into the java equivalent.

G= rand(10,20)<.5

Any ideas or suggestions?

Thanks,
Bhavya

Answer 1

There is no predefined method for filling your array with numbers, but instead you need to do lop over each element and assign it the number. Something like this:

Random random = new Random();

for (int outerIndex = 0; outerIndex < matrix.length; outerIndex++) {
    for (int innerIndex = 0; innerIndex < matrix[outerIndex].length; innerIndex++) {
        if (random.nextDouble() < 0.5) {
            matrix[outerIndex][innerIndex] = 1;
        } else {
            matrix[outerIndex][innerIndex] = 0;
        }
    }
}

This assumes that the default random generator is good enough. Adjust the 0.5 if you want higher probability for 1s or 0s.