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Re: How do I calculate a mean with python?

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On 09/17/2013 12:33 AM, William Bryant wrote:
> Hey I am new to python so go easy, but I wanted to know how to make a program that calculates the maen.
>
> List = [15, 6, 6, 7, 8, 9, 40]
> def mean():
>      global themean, thesum
>      for i in List:
>          thecount = List.count(i)
>          thesum = sum(List)
>      themean = thesum / thecount
>
> Why doesn't this work?
>

You want to compute the arithmetic mean, I suppose .. Which is the sum 
of all, divided by the number of samples. i.e: If you have n numbers or 
elements, your mean (arithmetic) would be mean = sum(elements)/n. Right ?

And then, n also doesn't need to be in the loop and list.count(i) gives 
the occurrences of i in your list, which you don't need.

list.count(15) gives 1.
thesum/list.count(15) doesn't change.


-- 
~Jugurtha Hadjar,

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Thread

How do I calculate a mean with python? William Bryant <gogobebe2@gmail.com> - 2013-09-16 16:33 -0700
  Re: How do I calculate a mean with python? Jugurtha Hadjar <jugurtha.hadjar@gmail.com> - 2013-09-17 00:52 +0100
  Re: How do I calculate a mean with python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-16 23:55 +0000
  Re: How do I calculate a mean with python? MRAB <python@mrabarnett.plus.com> - 2013-09-17 01:01 +0100
  Re: How do I calculate a mean with python? Jugurtha Hadjar <jugurtha.hadjar@gmail.com> - 2013-09-17 01:08 +0100
  Re: How do I calculate a mean with python? Cameron Simpson <cs@zip.com.au> - 2013-09-17 09:59 +1000
  Re: How do I calculate a mean with python? Dave Angel <davea@davea.name> - 2013-09-17 00:50 +0000
  Re: How do I calculate a mean with python? Travis Griggs <travisgriggs@gmail.com> - 2013-09-17 08:25 -0700
  Re: How do I calculate a mean with python? William Bryant <gogobebe2@gmail.com> - 2013-09-17 12:44 -0700
  Re: How do I calculate a mean with python? William Bryant <gogobebe2@gmail.com> - 2013-09-17 12:45 -0700
  Re: How do I calculate a mean with python? William Bryant <gogobebe2@gmail.com> - 2013-09-17 13:10 -0700
    Re: How do I calculate a mean with python? Joel Goldstick <joel.goldstick@gmail.com> - 2013-09-17 17:02 -0400
    Re: How do I calculate a mean with python? MRAB <python@mrabarnett.plus.com> - 2013-09-17 22:26 +0100
      Re: How do I calculate a mean with python? William Bryant <gogobebe2@gmail.com> - 2013-09-17 14:31 -0700
        Re: How do I calculate a mean with python? Joel Goldstick <joel.goldstick@gmail.com> - 2013-09-17 19:49 -0400
  Re: How do I calculate a mean with python? Bryan Britten <britten.bryan@gmail.com> - 2013-09-17 18:53 -0700

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