i am trying to plot fourier series ( even function )

syms n t;

To=4;

wo=pi/2;

n=1:5;

an=[(2/To).*(int(cos(n.*wo.*t),t,-1,1))-(2/To).*(int(cos(n.*wo.*t),t,1,3))]

bn=[(2/To).*int(1*sin(n.*wo.*t),t,-1,1)]

f= an.*cos(n.*wo.*t)+bn.*sin(n.*wo.*t)

plot(n,subs(f,t))

Error using plot A numeric or double convertible argument is expected

Error in fourierseries (line 10) plot(n,subs(f,t))

% I tried a bunch of stuff like double or ezplot , but nothing seems to work

[Image Analyst]

What are subs() and int()? They're not functions in any of my toolboxes, but I don't see you defining them as arrays either.

[John Medhat]

int() is the integration function subs() is the substitute fucntion

Answer 1

[KSSV]

clc; clear all ;
syms n t;
To=4;  
wo=pi/2;  
n=1:5;  
an=[(2/To).*(int(cos(n.*wo.*t),t,-1,1))-(2/To).*(int(cos(n.*wo.*t),t,1,3))] ;
bn=[(2/To).*int(1*sin(n.*wo.*t),t,-1,1)] ;  
f= an.*cos(n.*wo.*t)+bn.*sin(n.*wo.*t) ;
%
t1 = linspace(0,60) ;
f1 = double(subs(f,t1)) ;
plot(f1)

f1 is of 5 times of length(time), you have to pick what you want an dplot.

[John Medhat]

shouldn't it be something like this?