Incorrect number or types of inputs or outputs for function int

Recently, I have been working on a school task. I've tried my best searching in how to deal with my problem in order to finishing this task, but I've hit a wall on how to finish this.

close all; clear a; clc;
syms x y
x = [-pi:pi/10:pi];
sum=0;
y1=0;
for k=1:1:100
    y1=(((cos(k*pi)-1).*cos(k*x))./(-pi*(k^2)));
    sum=sum +y1;
end
y=sum+pi/2;

figure(1)
plot(x,y)
axis([-4 4 0.5 2.7])

g=zeros(1, length(x));
a0= int(y,x,-pi,pi)/(2*pi);
an= int(y,x,-pi,pi).*cos(n*x)/pi;
bn= int(y,x,-pi,pi).*sin(n*x)/pi;
for n=1:1:10
    f=an*cos(n*x)+bn*sin(n*x);
    g=g+f;
end
figure(2)
plot(x,g+a0)

[Dyuman Joshi]

In int() function, x is expected to be a symbolic variable, but you have over-written it as a numeric array. Thus you get that error.

Since I do not know what you are trying to do here, I can not provide any suggestion.

Please provide more information and specify the objective.

[윤형]

I want to Fourier transform the 'y' function using Euler's formulas.

Answer 1

[Torsten]

I don't understand your question. The Fourier series of y is y itself because it is already given as a series of cos(k*x) terms.