Originally Posted by

**new guy** Hi all ,

I'm a newbie with the Mathematica program . I'm trying to draw the function in the photo .

N=10

-2<t<2

In the second image you can see what I wrote . nonetheless ,I got a message says: **Syntax::sntxi: Incomplete expression; more input is needed.**

What am I doing wrong ?

Thanks (:

Don't use brackets for the exponential. Just use parenthesis. Also, should specify explicitly the Re or Im component of the function like:

Code:

Plot[Re[Sum[E^(2*Pi*I*k*t),
{k, -10, 10}]], {t, -2, 2}]