Two dimensional array slice in C#

Question

I'm looking to slice a two dimensional array in C#.

I have double[2,2] prices and want to retrieve the second row of this array. I've tried prices[1,], but I have a feeling it might be something else.

Thanks in advance.

Answer 1

There's no direct "slice" operation, but you can define an extension method like this:

public static IEnumerable<T> SliceRow<T>(this T[,] array, int row)
{
    for (var i = 0; i < array.GetLength(0); i++)
    {
        yield return array[i, row];
    }
}

double[,] prices = ...;

double[] secondRow = prices.SliceRow(1).ToArray();

Answer 2

Enumerable.Range(0, 2)
                .Select(x => prices[1,x])
                .ToArray();

Answer 3

The question is if you have a jagged or a multidimensional array... here's how to retrieve a value from either:

 int[,] rectArray = new int[3,3]
  {
      {0,1,2}
      {3,4,5}
      {6,7,8}
  };

 int i = rectArray[2,2]; // i will be 8

 int[][] jaggedArray = new int[3][3]
  {
      {0,1,2}
      {3,4,5}
      {6,7,8}
  };

  int i = jaggedArray[2][2]; //i will be 8

EDIT: Added to address the slice part...

To get an int array from one of these arrays you would have to loop and retrieve the values you're after. For example:

  public IEnumerable<int> GetIntsFromArray(int[][] theArray) {
  for(int i = 0; i<3; i++) {
     yield return theArray[2][i]; // would return 6, 7 ,8  
  }
  }