java Math.random() keeps repeating the same values in a vector

Asked Nov 21 '15 at 15:30

Active Nov 21 '15 at 15:30

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I'm using the JAMA package to generate a bunch of random vectors. Although it generates a random number for the element in each row, it repeats this same vector 100 times. How do I generate different values for each vector?

public static Matrix[] hundredVectors() { //generate 100 random init vectors
    Matrix[] storage = new Matrix[100]; //where all vectors are stored
    double[][] nums = new double[3][1]; //init vector
    for (int i = 0; i < 100; i++) {
        for (int j = 0; j < 3; j++) {
            nums[j][0] = Math.random();
            storage[i] = new Matrix(nums);
        }
    }
    return storage;
}

asked Nov 21 '15 at 15:30

as1216

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In each `new Matrix(nums);` you are passing same array from `nums` so it is nothing strange that each `Matrix` may see same data. – Pshemo Nov 21 '15 at 15:34
What is the problem? – lrleon Nov 21 '15 at 15:49
I can't see a problem.. Can you post the result you are getting and you are expecting..? – Ramesh-X Nov 21 '15 at 15:53
I solved the problem but initially this code was creating a vector (nums) with the same values 100 times in the storage array. – as1216 Nov 21 '15 at 16:10

java Math.random() keeps repeating the same values in a vector

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