Help with exponential Fourier series coefficients.

Problem:

Compute the exponential Fourier series coefficients numerically using MATLAB following the Computer Example. Modify the code for the signal for the figure below and plot the amplitude and phase spectra for this signal.

Here's the link to the figure http://imageshack.us/photo/my-images/705/phpayxvv9.png/

sample code to be modified:

----------------------

parameters:

T_0 = ??;

N_0 = 256;

T = T_0/N_0;

t = 0:T:T*(N0-1);

M = 10;

x(t) = ??

*to compute exponential fourier series

D_n = fft(x)/N_0;

n = [-N_0/2:N_0/2-1];

clf; subplot(2,2,1); stem(n,abs(fftshift(D_n)),'k');

axis([-M M -.1 .6]); xlabel('n'); ylabel('|D_n|');

subplot(2,2,2); stem(n,angle(fftshift(D_n)),'k');

axis([-M M -pi pi]); xlabel('n'); ylabel('\angle D_n [rad]');

This is what I have so far and I don't know what to do next.