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

Just in case someone wonders for Javascript.

var columnCount = 3
for(var i=0; i < 10; i++){
  var row = Math.floor(i/ columnCount )
  var col = i % columnCount 
  console.log(i, row, col)
}