Getting a double[] row array of a double[,] rectangular array

Question

Suppose you have an array like:

double[,] rectArray = new double[10,3];

Now you want the fouth row as a double[] array of 3 elements without do

Answer 1

Although this is an old thread, an addition to Joseph Sturtevants answer may be useful. His function crashes in case the matrix's first column is not zero, but another integer. This is e.g. always the case in case of retrieving data from Excel, like

object[,] objects = null;
Excel.Range range = worksheet.get_Range("A1", "C5");
objects = range.Cells.Value; //columns start at 1, not at 0

The GetRow function could be modified like this:

    public static T[] GetRow(T[,] matrix, int row, int firstColumn)
    {
        var columns = matrix.GetLength(1);
        var array = new T[columns];
        for (int i = firstColumn; i < firstColumn + columns; ++i)
            array[i-firstColumn] = matrix[row, i];
        return array;
    }