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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