How to find sum using single statement?

I had to find the sum of the series 1/2+(1/2)^2+....(1/2)^100

why does my code not work?

(ones(1,100).*1/2).^([1:100])

it gives the answer zero.

Answer 1

[Mischa Kim]

Airas, use

 f = sum(arrayfun(@(x) 0.5^x,1:100))

or, with your approach, add the sum()

 f = sum((ones(1,100).*1/2).^([1:100]))