Question

How do I convert a int[] to a matrix?

Let’s say I want to make 6×6 matrix and I have an int[] array with 36 elements.
So the 00 entry is the 0th element of the array, 01: 1 element, 02:, 2nd element and so forth.

Answer 1

how about:

int[] ints = new int[36];
// fill with values
int[][] matrix = new int[6][6];
for (int i = 0; i < ints.length; i++) {
    matrix[i / 6][i % 6] = ints[i];
}

To help you understand why this works, add the following inside the loop:

System.out.println("i = " + i + "; i / 6 = " + (i / 6) + "; i % 6 = " + (i % 6) + ";");