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1、1-1clearall;closeall;t=0:0.01:10;A=1;a=-0.4;ft=A*exp(a*t);plot(t,ft);1-2clearall;closeall;t=-3:0.001:3;ft=tripuls(t,4,0.5);plot(t,ft);ft1=tripuls(t,4,1);figure,plot(t,ft1);1-3clearall;closeall;t=0:0.001:4;T=1;Ft=rectpuls(t-2*T,T);plot(t,Ft);1-4clearall;closeall;k=-50:50;delt
2、a=[zeros(1,50),1,zeros(1,50)];stem(k,delta);1-5clearall;closeall;k=-50:50;uk=[zeros(1,50),ones(1,51)];stem(k,uk);2-1clearall;closeall;t=-3:0.001:3;ft=tripuls(t,4,0.5);subplot(3,1,1);plot(t,ft);title('f(t)');ft1=tripuls((2*t),4,0.5);subplot(3,1,2);plot(t,ft1);title('f(2t)');f
3、t2=tripuls((2-2*t),4,0.5);subplot(3,1,3);plot(t,ft2);title('f(2-2t)');2-2clearall;closeall;h=0.001;t=-3:h:3;ft=tripuls(t,4,0.5);subplot(3,1,1);plot(t,ft);title('f(t)');y1=diff(ft)*1/h;subplot(3,1,2);plot(t(1:length(t)-1),y1);title('thedifferentiationoff(t)');3-1clearall;clos
4、eall;t=-10:0.01:10;A=1;a=-0.4;ft=A*exp(a*abs(t));plot(t,ft);3-2clearall;closeall;r=0.02;t=-5:r:5;f1=1/2*exp(-2*t).*stepfun(t,0);f2=1/2*exp(-2*(t-1)).*stepfun(t-1,0);ft1=diff(f1)*1/r;ft2=diff(f2)*1/r;subplot(3,1,1);plot(t,f1);gridon;xlabel('t');ylabel('f(t)');title('f(t)');su
5、bplot(3,1,2);plot(t(1:length(t)-1),ft1);title('diff1');subplot(3,1,3);plot(t(1:length(t)-1),ft2);title('diff2');4-1clearall;closeall;symstf;f=fourier(exp((-2)*abs(t)));ezplot(f);4-2clearall;closeall;symstw;f=ifourier(1/(1+(w^2)),t);ezplot(f);ans1/2*exp(-t)*heaviside(t)+1/2*e
6、xp(t)*heaviside(-t)4-3clearall;closeall;r=0.02;t=-5:r:5;N=200;w=2*pi;k=-N:N;w=k*w/N;f1=1/2*exp(-2*t).*stepfun(t,0);F=r*f1*exp(-j*t'*w);F1=abs(F);P1=angle(F);subplot(3,1,1);plot(t,f1);gridon;xlabel('t');ylabel('f(t)');title('f(t)');subplot(3,1,2);plot(w,F1);xlabel('w');gridon
7、;ylabel('F(jw)');subplot(3,1,3);plot(w,P1*180/pi);grid;xlabel('w');ylabel('W');4-4clearall;closeall;R=0.02;t=-2:R:2;f=stepfun(t,-1)-stepfun(t,1);f1=f.*exp(-j*5*t);f2=f.*exp(j*5*t);W1=pi*5;N=500;k=-N:N;W=k*W1/N;F1=f1*exp(-j*t'*W)*R;F2=f2*exp(-j*t'*W)*R;F1=real(F1);F2=real(F2)
8、;subplot(2,1,1);plot(W,F1);xlabel('w');ylabel('F1(jw)');title('频谱F1(jw)');s
