Hi all,
I have an ArrayList1 of multiple values. Here is an exaple of the a potential ArrayList1:
a,a,b,,c,a,b,c, c,c,a,b
Does anyone have any suggestion whereby I could output the count for wach unique item:
a=4
b=3
c=4
I have done this in python with a defaultdict(int ) and was wondering if there was a quick way in C# to do this other than creating another ArrayList2 containing a unique set of the items from all od the items in ArrayList1 and then iterating through ArrayList1 counting the values for i where i is drevied from ArrayList2.
Any guidance or a starting point is much appreciated.
G.
2 12529
The list of values were kept in a dictionary so I have a dictionary with a key value pair where the value is a list of items. -
data = new Dictionary<string, List<string>>
-
I ended up placing the items from the value list of the dictionary into two additonal lists a list of distinct values (itemsunique) and then used a foreach loop on a complete list of all the values for all keys in the (allitems): -
List<string> allitems = new List<string>();
-
List<string> itemsunique = new List<string>();
-
-
foreach (KeyValuePair<string, List<string>> s in data)
-
{
-
foreach (string h in s.Value)
-
{
-
allitems.Add(h);
-
allitems.Sort();
-
-
if (!itemsunique.Contains(h))
-
{
-
itemsunique.Add(h);
-
itemsunique.Sort();
-
}
-
-
}
-
}
-
-
-
int count = 0;
-
foreach (string y in itemsunique)
-
{
-
count = allitems.count(n=> n == y);
-
Console.Writeline("{0}={1} ", y, count);
-
}
-
However I will have several lists that I will need to apply this to and afraid that this will be memory intensive if I have to do with each list considering some lists will be quite large with over 100k items.
Any suggestions or comments are appreciated.
Thanks.
g.
Further I was able to do the same using a hashtable: -
-
Hashtable items = new Hashtable();
-
if (!items.Contains(itemfromlist))
-
items.Add(itemfromlist, 1);
-
else
-
items[itemfromlist] = (int) items[itemfromlist]+1
-
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