Fs = 20;
t = 0:10/Fs:150;
m = sin(t);
figure(1);
subplot(3,1,1);
plot(t,m);
title('Sine wave');
k=0;
for i=1:2:1000
    if(i==1)
        y = sin(i*t);
    else
        y = sin(i*t)/i;
    end
    k = k+y;
end
figure(1);
subplot(3,1,2);
plot(t,k);
title('Square wave');
h = fft(k);
figure(1);
subplot(3,1,3);
plot(t,h);
title('Fourier Transform');
figure(2);
subplot(3,1,1);
plot(t,m);
title('Sine wave');
h=0;
for i=1:1:1000
    if(i==1)
        y = sin(i*t);
    else
        y = sin(i*t)/i;
    end
    h = h+y;
end
figure(2);
subplot(3,1,2);
plot(t,h);
title('Triangular wave');
l = fft(h);
figure(2);
subplot(3,1,3);
plot(t,l);
title('Fourier Transform');