elementwise multiplication of 2 lists of numbers

Bruno Desthuilliers bruno.42.desthuilliers at websiteburo.invalid
Mon Sep 20 16:28:12 CEST 2010


harryos a écrit :
> hi
> I have 2 lists of numbers,say
> x=[2,4,3,1]
> y=[5,9,10,6]
> I need to create another list containing
> z=[2*5, 4*9, 3*10, 1*6]  ie =[10,36,30,6]
> 
> I did not want to use numpy or any Array types.I tried to implement
> this in python .I tried the following
> 
> z=[]
> for a,b in zip(x,y):
>         z.append(a*b)
> This gives me the correct result.Still,Is this the correct way?

If it gives the expected results then it's at least *a* correct way !-)

> Or can this be done in a better way?

A list comp comes to mind, as well as using itertools.izip if your lists 
are a bit on the huge side.

from itertools import izip
z = [a * b for a, b in izip(x, y)]





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