Generic List - Count (where)

[Shansen]

All,

Hoping some of the senior members may be able to assist...

I've a generic list populated by doubles each bound between 0 & 1. To map the distribution of elements between 0 & 1, I'm trying to count the number of elements < 0.1, then count the number of elements < 0.2, then < 0.3 etc.

I originally thought the Count() method would be the way to go... but have no idea how to apply it to a single list.
http://msdn.microsoft.com/en-us/library/bb535181.aspx

As always any assistance would be appreciated.
Regards
Shannon

[NinjaTrader_Bertrand]

Shannon, from a quick look - wouldn't FindAll be a start for your tasks?

http://msdn.microsoft.com/en-us/library/fh1w7y8z.aspx

[Shansen]

Bertrand,

Thanks for the solid guidance.

Another question, a Count of the TheList.FindAll(item => item <= 0.5) yields the number of elements in the list that satisfy the requirement (item <= 0.5). Brilliant. And, as expected, TheList.Count is the total number of elements in The.List.

I've tested these two parts separately, however, when combined to give the percentage of elements that satisfy the requirement (below) it all goes awry. It returns a zero or a one, as opposed to some number bound by zero and one.

TheList.FindAll(item => item <= 0.5).Count / TheList.Count

As Always any ideas would be appreciated.
Regards
Shannon

[NinjaTrader_Bertrand]

Hi Shannon, I would tip on a division or precision issue here - could that be the case?

[koganam]

Your operands are integers: cast them to doubles first, before you do the division. Also check for a zero divisor.

[Shansen]

koganam,

You nailed it!
The divisor was an integer. Cast to a double it works the treat.

Thanks again
Shannon