Trying to convert an int[] into int[,] using C#

Question

I would like a function to convert a single dimension array int[480000] into a 2d array of size int[800,600]. Can you please help me how this can be done?

Answer 1

public static T[,] Convert<T>(this T[] source, int rows, int columns)
{
  int i = 0;
  T[,] result = new T[rows, columns];

  for (int row = 0; row < rows; row++)
    for (int col = 0; col < columns; col++)
      result[row, col] = source[i++];
  return result;
}

Answer 2

Do you really want to physically move the data or would a 800x600 'View' be sufficient?
You could use a wrapper like this:

// error checking omitted
class MatrixWrapper<T>
{
    private T[] _data;
    private int _columns;

    public MatrixWrapper(T[] data, int rows, int columns)
    {
        _data = data;
        _columns = columns;
        // validate rows * columns == length
    }

    public T this[int r, int c]
    {
        get { return _data[Index(r, c)]; }
        set { _data[Index(r, c)] = value; }
    }

    private int Index(int r, int c)
    {
        return r * _columns + c;
    }
}

And you use it like:

        double[] data = new double[4800];
        var wrapper = new MatrixWrapper<double>(data, 80, 60);
        wrapper[2, 2] = 2.0;