/// <summary>
/// Gets a column vector from a matrix.
/// </summary>
///
public static T[,] GetPlane <T>(this T[,,] m, int index, T[,] result = null)
{
int rows = m.Rows();
int cols = m.Columns();
int depth = m.Depth();
if (result == null)
{
result = new T[rows, cols];
}
index = Matrix.index(index, depth);
for (int i = 0; i < rows; i++)
{
for (int j = 0; j < cols; j++)
{
result[i, j] = m[i, j, index];
}
}
return(result);
}