CODEWITHSUNDEEP
pythonnumpy
balibakbar
balibakbar

Reputation: 269

how to compute the mean of values from different lists

I need to compute the means of of the first elements in each list, the second elemnts in each list etc and get a list of these means. So i need to get a list d = [5/3, 10/3, ...etc from the following

    $
    a = [1,2,2,2,3,4,3]
    b = [2,3,1,9,5,4,6]
    c = [2,5,6,7,8,2,4]

can numpy do this in some way?

Upvotes: 3

Views: 174

Answers (3)

Bi Rico
Bi Rico

Reputation: 25813

Since the question has a numpy tag, I thought I would add a numpy answer too:

numpy.mean([a, b, c], axis=0)

Upvotes: 3

ovgolovin
ovgolovin

Reputation: 13410

You can do it without NumPy:

>>> map(lambda x: sum(x)/3., zip(a,b,c))
[1.6666666666666667, 3.3333333333333335, 3.0, 6.0, 5.333333333333333, 3.3333333333333335, 4.333333333333333]

Upvotes: 2

aaronasterling
aaronasterling

Reputation: 71004

Just zip them together.

>>> list(zip((1, 2, 3), (1,2,3), (1,2,3)))
[(1, 1, 1), (2, 2, 2), (3, 3, 3)]

From there, you can iterate over the result and take the means as you need them.

Upvotes: 2

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