Create a function that generates different periodic signals

This is what I tried so far, but my solution doesnt seen to be working, in a plot it gives me 4 straight lines. Can someone help me find my mistake ? Thank you so so much!

function[f]=signal(s,t,A,M,T,N)

switch s
    case 'Carre'
        for n=1:N
            S=S+(((4*A)/(N*pi))*sin((N*pi)/2)*cos(((2*N*pi)*t)./T));
        end
        f=M+S;
    case 'Triangle'
        for n=1:N
            S=S+(((8*A)/(N^2*pi^2))*cos(((2*N*pi)*t)./T));
        end
        f=M+S;
    case 'Scie'
        for n=1:N
            S=S+(((-1)^(N+1))*((2*A)/(N*pi))*sin(((2*N*pi)*t)./T));
        end
        f=M+S;
    case 'Cosinus'
        for n=1:N
            S=S+(A*cos(((2*N*pi)*t)./T));
        end
        f=M+S;
    otherwise
        disp('Error. Name of the signal incorrectly entered.')
end
end

[Voss]

Try changing N to n inside the for loops.

Answer 1

[KSSV]

I will show one, you may try the others. Check the code though. Is the plot looks like is what you expected?

t = 0:0.01:10 ;  % time 
A = 2 ;
M = 1;   % MEan value
N = 10 ; 
n = 1:N ;
T = 4 ; 

nt = length(t) ; 
F = zeros(nt,1) ; 
for i = 1:nt
    f = 4*A./(n*pi).*sin(n*pi/2).*cos(2*n*pi*t(i)/T) ;
    F(i) = M+sum(f) ; 
end
plot(t,F)