Feddas - Shawn Featherly

I remember converting flat arrays to multi-dimensional arrays all the time in college. For the life of me I couldn't find much code about this topic online. I had to create my own utility functions:

private T[,] toRectangular<T>(T[] flatArray, int width)
{
    int height = (int)Math.Ceiling(flatArray.Length / (double)width);
    T[,] result = new T[height, width];
    int rowIndex, colIndex;

    for (int index = 0; index < flatArray.Length; index++)
    {
        rowIndex = index / width;
        colIndex = index % width;
        result[rowIndex, colIndex] = flatArray[index];
    }
    return result;
}

private T[] toFlat<T>(T[,] rectArray)
{
    int width = rectArray.GetUpperBound(1) + 1;
    T[] result = new T[rectArray.Length];

    for (int i = 0; i < result.Length; i++)
    {
        result[i] = rectArray[i / width, i % width];
    }
    return result;
}

private void testIt()
{
    int width = 4;
    int[] flatStuff = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14};
    int[,] rectStuff = toRectangular(flatStuff, width);
    int[] flatAgain = toFlat(rectStuff);
}

Labels: Arrays, C#, one-dimensional, two-dimensional