/*
clear
clc
xdel(winsid());
x=linspace(0,20*%pi,50);
y=cos(2*%pi*x/16);
subplot(2,1,1)
plot(x,y)
xtitle('Funkcja cosinus')
X=fft(y,-1);
subplot(2,1,2)
plot2d3(x,real(X))
plot(x,real(X), 'ro');
xtitle('FFT funkcji cosinus')
*/
/*
clear
clc
xdel(winsid());
n=0:10;
a=n+1;
x=a.*sin(2*%pi*n/10);
X=fft(x);
plot(a,x)
figure
plot2d3(n,real(X))
plot(n,real(X),'ro')
a = gca () ;
a.x_location ="origin";
a.y_location ="left";
*/
clear
clc
xdel(winsid());

n=0:15;
a=0.3;
w=5:0.5:12.5;
x=a.*sin(w.*%pi.*n/16);
X=fft(x);
plot(n,x)
figure
plot2d3(n,real(X))
plot(n,real(X),'ro')

a = gca () ;
a.x_location ="origin";
a.y_location ="left";