C:/Documents and Settings/Stephen/Desktop/Biostatistics Library and Program/Biostatistics/GroupsCollection.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace StephenAshley.Biostatistics
{
   using NUMBER = Decimal;

   public class GroupsCollection : IEnumerable
   {
      #region ****** fields ******
      protected Group[] groupsArray;

      private Group elementsGroup;
      #endregion
      #region *** constructors ***
      public GroupsCollection()
      {
         elementsGroup = new Group(0);
      }

      // <summary>
      // Creates a <see cref="GroupsCollection"/> with a given capacity.
      // </summary>
      // <param name="capacity">The capacity of the <see cref="GroupsCollection"/>.</param>
      //public GroupsCollection(Int32 capacity)
      //   : this()
      //{
      //   groupsArray = new Group[capacity];
      //}

      public GroupsCollection(List<Group> lstGroups)
         : this()
      {
         if (lstGroups == null)
            throw new BiostatisticsException(
   "groups parameter in constructor for GroupsCollection is null.");

         groupsArray = lstGroups.ToArray();
         foreach (Group group in lstGroups)
            elementsGroup.AddRange(group.ToArray());
      }
      #endregion
      #region ***** methods ******
      public virtual void Add(Group group)
      {
         if (group == null)
            throw new BiostatisticsException(
               "group parameter in Add method of GroupsCollection is null.");

         // Create a temporary list of Groups
         List<Group> groupList = new List<Group>();
         // If groupsArray already contains some Groups,
         //put them in groupList
         if (groupsArray != null)
            groupList = groupsArray.ToList<Group>();
         // Add the new group
         groupList.Add(group);
         // Put all the groups into groupsArray
         groupsArray = groupList.ToArray();
         // Add the members of the new Group to elementsGroup
         elementsGroup.AddRange(group.ToArray());
      }

      public virtual void AddRange(List<Group> groups)
      {
         if (groups == null)
            throw new BiostatisticsException(
               "groups parameter in AddRange method of GroupsCollection is null.");
         if (groupsArray == null)
            groupsArray = new Group[groups.Count];
         List<Group> groupList = groupsArray.ToList<Group>();
         groupList.AddRange(groups);
         groupsArray = groupList.ToArray();
         foreach (Group group in groups)
            elementsGroup.AddRange(group.ToArray());
      }

      public IEnumerator GetEnumerator()
      {
         return groupsArray.GetEnumerator();
      }

      public Int32 k()
      {
         if (groupsArray == null)
            return 0;
         else
            return groupsArray.Length;
      }

      public Int32 nTotal()
      {
         return elementsGroup.n();
      }

      public NUMBER MeanTotal()
      { return elementsGroup.Mean(); }

      public NUMBER SumTotal()
      { return elementsGroup.Sum(); }

      public Group this[int index]
      {
         get
         {
            Group group;
            try
            {
               group = groupsArray[index];
            }
            catch (Exception e)
            {
               throw new BiostatisticsException(e.Source + ": " + e.Message, e);
            }
            return groupsArray[index];
         }
         set
         {
            try
            {
               groupsArray[index] = value;
            }
            catch (Exception e)
            {
               throw new BiostatisticsException(e.Source + ": " + e.Message, e);
            }
            elementsGroup = new Group(0);
            foreach (Group group in elementsGroup)
               elementsGroup.AddRange(group.ToArray());
         }
      }
      #endregion

   }
}

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