Question

say I have a 1D array like int[] x = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}.
I would like to conver it into 2D where it looks like:

1 5  9 13  
2 6 10 14  
3 7 11 15  
4 8 12 16  

Currently, I have

for (int i = 0; i < 4; i++)
{
    for (int j = 0; j < Nb; j++)
        s[i][j] = x[i + j];
}

However, that doesnt work. How would I do this?

Answer 1

Try

for (int i = 0, k=0; i < 4; i++)
  for (int j = 0; j < Nb; j++)
    s[j][i] = x[k++]; // you may want s[i][j]