computing a weighted sum

Fernando Perez fperez.net at gmail.com
Wed Mar 16 23:22:51 CET 2005


andreif at mail.dntis.ro wrote:

> Suppose I have a list of n floats x and a list of n floats w and I want
> to compute x[0]*w[0] + .. + x[n-1]*w[n-1].
> 
> Is there some elegant expression (perhaps using lambda) to have it done
> in one statement ? As in :
>      y = lambda x,w : ...
> 
> I ask because the way I am doing it now :
>       y = 0
>       for i in range(0,n): y += x[i]*w[i]
> 
> doesn't seem very pythonic :)
> 
> Thanks,
> Andrei
> 

import Numeric
print Numeric.dot(x,w)

Best,

f




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