elementwise multiplication of 2 lists of numbers
Peter Otten
__peter__ at web.de
Mon Sep 20 18:33:30 CEST 2010
harryos wrote:
> 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?
> Or can this be done in a better way?
>
> Any pointers most welcome,
Finally, if you have a lot of data that you want to process efficiently
consider using numpy arrays instead of lists:
>>> import numpy
>>> x = numpy.array([2,4,3,1])
>>> y = numpy.array([5,9,10,6])
>>> x*y
array([10, 36, 30, 6])
Peter
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