Convert list of string into double then get average value

Question

Is there an easy way to directly convert my list of string into double data type and get the average value.

Here is my current list result:

["6.3000e-009", "7.3319e-009", "7.8303e-009"]

expected result:

7.15E-09

Any suggestion/Comments TIA.

Please do some research and if you can't figure it out, include what you have tried in your question. This is something that can be easily found with minimal research. — 41686d6564 stands w. Palestine, Apr 01 '19 at 00:32
Possible duplicate: [How to convert list of strings to doubles](https://stackoverflow.com/q/3365480/4934172) — 41686d6564 stands w. Palestine, Apr 01 '19 at 00:35
I downvoted this because you have two questions (how to convert strings to doubles and how to get an average of a list of doubles), both of which are super easy to google an answer to. — DavidG, Apr 01 '19 at 00:47

score 2 · Accepted Answer · answered Apr 01 '19 at 00:37

2

You can use Linq to get the average:

var avg = input.Select(double.Parse).Average();

answered Apr 01 '19 at 00:37

Kirill Polishchuk

3

Or simply `input.Average(double.Parse)` – DavidG Apr 01 '19 at 00:53
@DavidG, this won't compile btw – Kirill Polishchuk Apr 01 '19 at 01:11
Yes it will, [for example](https://ideone.com/YEm5U4) – DavidG Apr 01 '19 at 01:13
@DavidG https://dotnetfiddle.net/IffIBu – Kirill Polishchuk Apr 01 '19 at 02:05
I've just shown you it working. I don't know what that site is doing but the code works in my link and in LinqPad. – DavidG Apr 01 '19 at 02:10
@DavidG, seems it works in mono compiler only – Kirill Polishchuk Apr 01 '19 at 02:10
@DavidG, try your code in Visual Studio and let me know the result :D – Kirill Polishchuk Apr 01 '19 at 02:12
@KirillPolishchuk Yes, it doesn't compile in Visual Studio (at least up to VS2017 and .NET 4.7.1). – 41686d6564 stands w. Palestine Apr 01 '19 at 16:36

score 1 · Answer 2 · answered Apr 01 '19 at 00:37

1

you can use Linq to objects to do this quite easily

something like..(untested)

var result = yourArray.Select( s => Double.Parse(s) ).Average();

answered Apr 01 '19 at 00:37

Tim Jarvis

2 Answers2