Error: Unexpected MATLAB expression.

I simply do not understand how there is an error here,

>> f = symsum((1/(2*n-1))*sin((2*n-1)2*x), n, 1, 5)

                                 ↑ Error: Unexpected MATLAB expression.

To clarify the arrow is pointing at the "2" next to "x".

Edit: I have defined x and n as symbolic, but the error still occurs.

Answer 1

[Birdman]

You have not defined n and x as symbolic.

syms n x
f = symsum((1/(2*n-1))*sin((2*n-1)*2*x), n, 1, 5)

[Ian Bathgate]

The error still occurs

[Birdman]

I edited the equation. There was a operator missing. Now check the answer.

[Ian Bathgate]

Thank you so much, I sat there looking at it for nearly 20 minutes. thanks.

Answer 2

[Jan]

"(2*n-1)2*x" is no valid Matlab expression, because the operator after ")" is missing. I guess:

f = symsum((1/(2*n-1))*sin((2*n-1) * 2*x), n, 1, 5) 
%                                  ^ inserted

[Birdman]

Exactly

[Jan]

:-) This was a duplicate answer given in the same minute.