Fourier Series of Rectified Cosine Function

Why isn't this script running?

%% Problem 17.9

display('Problem 17.9')

% Determine the Fourier coefficients an and bn of the

% first three harmonic terms of the rectified cosine

% wave

syms n t

T = 8;

Wo=2*pi/T;

n = 1:3;

an = (2/T)*[int(2.5*cos(n*Wo*t)*cos(n*Wo*t),-2,2)]

AN_numeric = double(an)

Answer 1

[Star Strider]

Try this:

syms n t 
T = 8;
Wo=2*pi/T;
nv = (1:3);
an = (2/T)*int(2.5*cos(n*Wo*t)*cos(n*Wo*t),t,-2,2)
AN_numeric = double(subs(an,{n},{nv}))

.

[Salik Mallick]

Thanks Mr. Strider.

How do I plot the full wave to determine the period for the below function?

%% Problem 17.1_e

display('Problem 17.1_e')

% Evaluate each of the following functions and see if it

% is periodic. If periodic, find its period.

syms t

D = deg2rad(10);

D1 = rad2deg(D);

E = deg2rad(50);

E1 = rad2deg(E);

z = 4.2*sin(0.4*pi*t + D1) + 0.8*sin(0.6*pi*t + E1)

figure

ezplot(z,[-pi/2,pi/2]), grid on

[Star Strider]

Simply expand the limits:

ezplot(z,[-5*pi,5*pi])

Since this is obviously homework, I leave the rest to you.