c # list to find the Mode and median

Question

_{Tuesday, October 24, 2017 8:31 AM}

c # list<int> to find the Mode and median

please verify my account

All replies (2)

_{Tuesday, October 24, 2017 8:45 AM ✅Answered}

Check the link given below

https://blogs.msmvps.com/deborahk/linq-mean-median-and-mode/

Ashish Pandey

_{Wednesday, October 25, 2017 7:38 AM ✅Answered | 1 vote}

Hello lctk,

There is a way that meet your requirement without using Linq.

static class ExtendMethod {

        public static decimal GetMedian(this IEnumerable<int> source)
        {
            // Create a copy of the input, and sort the copy
            int[] temp = source.ToArray();
            Array.Sort(temp);
            int count = temp.Length;
            if (count == 0)
            {
                throw new InvalidOperationException("Empty collection");
            }
            else if (count % 2 == 0)
            {
                // count is even, average two middle elements
                int a = temp[count / 2 - 1];
                int b = temp[count / 2];
                return (a + b) / 2m;
            }
            else
            {
                // count is odd, return the middle element
                return temp[count / 2];
            }
        }
        public static int GetMode(this IEnumerable<int> list)
        {
            // Initialize the return value
            int mode = default(int);
            // Test for a null reference and an empty list
            if (list != null && list.Count() > 0)
            {
                // Store the number of occurences for each element
                Dictionary<int, int> counts = new Dictionary<int, int>();
                // Add one to the count for the occurence of a character
                foreach (int element in list)
                {
                    if (counts.ContainsKey(element))
                        counts[element]++;
                    else
                        counts.Add(element, 1);
                }
                // Loop through the counts of each element and find the 
                // element that occurred most often
                int max = 0;
                foreach (KeyValuePair<int, int> count in counts)
                {
                    if (count.Value > max)
                    {
                        // Update the mode
                        mode = count.Key;
                        max = count.Value;
                    }
                }
            }
            return mode;
        }
    }

For How to use:

List<int> list = new List<int> { 22, 43, 54, 12, 32, 54, 234, 13, 43, 4, 2, 12, 43, 12, 23, 12 };

  Console.WriteLine(list.GetMedian().ToString());

  Console.WriteLine(list.GetMode().ToString());

Sincerely,

Neil Hu

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