Convert 1D array index to 2D array index

Question

I have 2 arrays. I want to convert the index of the first array to the second. Is there a better way to do it than what I have below?

Array array1[9];
Array          


        

Answer 1

You can do this mathematically using modulus and integer division, given your second array is a 3x3 array the following will do.

p.y = index % 3;
p.x = index / 3;