Plotting the Fourier Series

Hi,

I am trying to plot the x(t) and t should be between -3 to 3. I calculate the a_k and I used the code given below. However, I could not get the plot what I expect. Capital T should be equal to 2. What is wrong in these lines? Thank you very much.

 f=0;
 t=linspace(-3,3);
 for k=-100:1:100
     a_k= (((pi^2)*(k^2)*(1^2)-2*(pi^2)*(k^2)-2*(2^2).*sin((k*pi*1/2))+2*pi*k*2*1.*cos((k*pi*1/2)))/2*(pi^3)*(k^3));
     f=f+a_k*(exp(j*2*pi*k*t/2));  % for T=2
 end

 

 figure;
 plot(t,f);

[Sharmin Kibria]

Hi,

Can you write down the mathematical expression you are using for calculating the values of a_k? It will easier for me check if it getting calculated correctly.

Thanks

Sharmin