Function for fourier series

hello

I have written a function for fourier series but when i try to plot it ,only the consine one shows up did I forget something ? Danke schön

function ft = signal(S,t,A,M,T,N)

for n=1:N
   
   if S=="square"
       ft=M+sum(((4*A)./(n.*pi)).*sin((n.*pi)/2).*cos((2*n.*pi.*t)./T));
    
   elseif S=="triangle"
       ft=M+sum(((8*A)./(n.^2*pi^2)).*cos((2*n*pi.*t)./T));
    
   elseif S=="saw"
       ft=M+sum(-1^(n+1).*(2*A./n.^pi).*sin((2*n.*pi*t)./T));
    
elseif S=="cosine"
       ft=M+A*cos((2*pi.*t)./T);
   end
end

%%plot part 

M=0;
A=1;
T=10; 
t=0:0.1:60; 
N=10;

grid on
ft=signal("square",t,A,M,T,N);
plot(t,ft,'r')

hold on

ft=signal("triangle",t,A,M,T,N);
plot(t,ft,'b')

hold on

ft=signal("saw",t,A,M,T,N);
plot(t,ft,'g')

hold on

ft=signal("cosine",t,A,M,T,N);
plot(t,ft,'k')
%%

Answer 1

[Star Strider]

Try this —

%%plot part 

M=0;
A=1;
T=10; 
t=0:0.1:60; 
N=10;

figure
subplot(4,1,1)
ft=signal("square",t,A,M,T,N);
plot(t,ft,'r')

subplot(4,1,2)

ft=signal("triangle",t,A,M,T,N);
plot(t,ft,'b')

subplot(4,1,3)

ft=signal("saw",t,A,M,T,N);
plot(t,ft,'g')

subplot(4,1,4)

ft=signal("cosine",t,A,M,T,N);
plot(t,ft,'k')

%%


function ft = signal(S,t,A,M,T,N)
n=(1:N).';
   
   if S=="square"
       ft=M+sum(((4*A)./(n.*pi)).*sin((n.*pi)/2).*cos((2*n.*pi.*t)./T));
    
   elseif S=="triangle"
       ft=M+sum(((8*A)./(n.^2*pi^2)).*cos((2*n*pi.*t)./T));
    
   elseif S=="saw"
       ft=M+sum(-1.^(n+1).*(2*A./n.^pi).*sin((2*n.*pi*t)./T));
    
elseif S=="cosine"
       ft=M+A*cos((2*pi.*t)./T);
   end

end

The loop was not executing correctly. I eliminated the for loop and changed the code to use ‘n’ as a column vector to take advantage of MATLAB’s vectorisation abilities. (I plotted them as subplots because I wanted to see the individual results more clearly.) Otherwise (except for a minor change in the ‘saw’ calculation) the code is unchanged.

EDIT — (24 Feb 2022 at 15:06)

Changed original answer text to one that actually addresses the problem.

.

[Rayan Maye]

How dumb of me of not vectorizing n,thanks for your help mate

[Star Strider]

As always, my pleasure!

Answer 2

[Rayan Maye]

Tried it ,did'nt work but thanks.I'm suspecting the problem is maybe a mistake that I did in the transcription of mathematical formulas.