clc
close(gcf)
clear all;
disp('Wykreślanie wsp. szeregu Fouriera dowolnej funkci');
funs=input('Podaj wzór funkcji f(t)=','s');
tk=input('Podaj czas końcowy tk[s]=');
Lp=1024;
Tobs=tk-0;
df=1/Tobs;
fmax=df*Lp/2;
t=[0:Tobs/Lp:Tobs-Tobs/Lp];
fun=eval(funs);
subplot(2,2,1)
plot(t,fun);
title('Przebieg funkcji f(t)');
xlabel('Czas t[s]');
grid on
FUN=fft(fun);
FUNp=FUN(1:Lp/2)/Lp*2;
FUNp(1)=FUNp(1)/2;
m=abs(FUNp);
subplot(2,2,2)
f=[0:df:fmax-df];
axis([0 fmax 0 max(m)]);
hold on
grid on
bar(f,m);
title('Widmo amplitudowe funkcji f(t)-współczynniki abs(cn)')
xlabel('Częstotliwość f[Hz]');
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