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实验四symstwf1=sym('Heaviside(2*t+1)-Heaviside(2*t-1)');Fw=fourier(f1,w);FFw=maple('convert',Fw,'piecewise');FFP=abs(FFw);ezplot(FFP,[-10*pi10*pi]);grid;axis([-10*pi10*pi01.2])symstwf2=exp(-1*t)*sym('Heaviside(t)');Fw=fourier(f2,w);FFw=maple('convert',Fw,'piecewise');FFP=abs(FFw);ezplot(FFP,[-10*pi10*pi]);grid;axis([-10*pi10*pi01.2])symstwFw=sym('(-1*(w^2)+5*i*w-8)/(-1*(w^2)+6*i*w+5)');ft=ifourier(Fw,w,t)ft=dirac(t)+(2*exp(-5*t)-3*exp(-t))*heaviside(t)实验五num=[101];den=[125];[z,p]=tf2zp(num,den)zplane(z,p)z=0+1.0000i0-1.0000ip=-1.0000+2.0000i-1.0000-2.0000inum=[020];den=[12.^0.51];w=logspace(-1.5,1.5)freqs(num,den,w)实验六a=[144];b=[13];y1=impulse(b,a,0:0.5:5)y2=step(b,a,0:0.5:5)subplot(2,1,1),impulse(b,a,5)subplot(2,1,2),step(b,a,5)y1=1.00000.55180.27070.12450.05490.02360.00990.00410.00170.0007y2=00.38210.58080.67530.71790.73650.74440.74770.74910.7496a=[144];b=[13];t1=0:0.01:5;x1=exp(-1*t1);lsim(b,a,x1,t1),holdon;t2=0:0.5:5;x2=exp(-1*t2);lsim(b,a,x2,t2),holdoffa=[121];b=[100];impz(b,a,0:20)y=impz(b,a,0:20)y=1-23-45-67-89-10a=[121];b=[100];k=0:10;x1=stepfun(k,0);y=filter(b,a,x1)stem(k,y)y=1-12-23-34-45-56a=[121];b=[100];k=0:10;x2=(1/4).^k;y=filter(b,a,x2)stem(k,y)y=1.0000-1.75002.5625-3.35944.1602-4.96005.7600-6.56007.3600-8.16008.9600
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