int rows = (array.Length + cols - 1) / cols; //ceiling function to determine rows needed
        int pos = array.Length - cols;  //starting position in index transfer
        int offset = 0;                 //needed when negative index reached
        for (int i = 0; i < rows; i++)
        {
            for (int j = 0; j < cols; j++)
            {
                if (pos + j >= 0)
                    array[cols * i + j - offset] = temp[pos + j];    //assign values of temp to array
                else
                    ++offset; //takes care of negative indeces
            }
            pos -= cols;
        }

        return array;