求cos(2*pi*t)[ε(t)-ε(t-4)]的拉氏变换和振幅频谱的MATLAB程序，，急！！！！！！！！！！！！！！！

Question

如题所述

Answer 1

%求cos(2*pi*t)[ε(t)-ε(t-4)] 拉氏变换

syms t s

ft=cos(2*pi*t)*(heaviside(t)-heaviside(t-4));

Fs=laplace(ft)

%傅里叶变换

syms t w

Gt=cos(2*pi*t)*(heaviside(t)-heaviside(t-4));

Fw=fourier(Gt,t,w);

%FFw=maple('convert',Fw,'piecewise');

FFP=abs(Fw);

ezplot(FFP,[-10*pi,10*pi]);

grid;

set(gca,'Ylim',[0,2.5]);