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1、WORD格式可编辑M2-1(1)t=-2:0.001:4;T=2;xt=rectpuls(t-1,T);plot(t,xt)axis([-2,4,-0.5,1.5])图象为：(2)t=sym('t');y=Heaviside(t);ezplot(y,[-1,1]);gridonaxis([-11-0.11.1])图象为：专业技术资料整理WORD格式可编辑(3)A=10;a=-1;B=5;b=-2;t=0:0.001:10;xt=A*exp(a*t)-B*exp(b*t);plot(t,xt)图象为：(4)t=sym('t');y=t*Heaviside(t);ezplot(y,
2、[-1,3]);gridonaxis([-13-0.13.1])图象为：专业技术资料整理WORD格式可编辑(5)A=2;w0=10*pi;phi=pi/6;t=0:0.001:0.5;xt=abs(A*sin(w0*t+phi));plot(t,xt)图象为：(6)A=1;w0=1;B=1;w1=2*pi;t=0:0.001:20;xt=A*cos(w0*t)+B*sin(w1*t);plot(t,xt)图象为：专业技术资料整理WORD格式可编辑(7)A=4;a=-0.5;w0=2*pi;t=0:0.001:10;xt=A*exp(a*t).*cos(w0*t);plot(t,
3、xt)图象为：(8)w0=30;t=-15:0.001:15;xt=cos(w0*t).*sinc(t/pi);plot(t,xt)axis([-15,15,-1.1,1.1])图象为：专业技术资料整理WORD格式可编辑M2-3（1）functionyt=x2_3(t)yt=(t).*(t>=0&t<=2)+2*(t>=2&t<=3)-1*(t>=3&t<=5);（2）functionyt=x2_3(t)yt=(t).*(t>=0&t<=2)+2*(t>=2&t<=3)-1*(t>=3&t<=5);t=0:0.001:6;subplot(3,1,1)plot(t,x2_3(t)
4、)title('x(t)')axis([0,6,-2,3])subplot(3,1,2)plot(t,x2_3(0.5*t))title('x(0.5t)')axis([0,11,-2,3])subplot(3,1,3)plot(t,x2_3(2-0.5*t))title('x(2-0.5t)')axis([-6,5,-2,3])图像为：专业技术资料整理WORD格式可编辑M2-9（1）k=-4:7;xk=[-3,-2,3,1,-2,-3,-4,2,-1,4,1,-1];stem(k,xk,'file')（2）k=-12:21;x=[-3,0,0,-2,0,0,3,0,0,1,0
5、,0,-2,0,0,-3,0,0,-4,0,0,2,0,0,-1,0,0,4,0,0,1,0,0,-1];subplot(2,1,1)stem(k,x,'file')title('3倍内插')t=-1:2;y=[-2,-2,2,1];subplot(2,1,2)stem(t,y,'file')title('3倍抽取')axis([-3,4,-4,4])专业技术资料整理WORD格式可编辑（3）k=-4:7;x=[-3,-2,3,1,-2,-3,-4,2,-1,4,1,-1];subplot(2,1,1)stem(k+2,x,'file')title('x[k+2]')subplo
6、t(2,1,2)stem(k-4,x,'file')title('x[k-4]')（4）k=-4:7;x=[-3,-2,3,1,-2,-3,-4,2,-1,4,1,-1];stem(-fliplr(k),fliplr(x),'file')title('x[-k]')专业技术资料整理WORD格式可编辑M3-1（1）ts=0;te=5;dt=0.01;sys=tf([21],[132]);t=ts:dt:te;x=exp(-3*t);y=lsim(sys,x,t);plot(t,y)xlabel('Time(sec)')ylabel('y(t)')（2）ts=0;te=5;dt=1
7、;sys=tf([21],[132]);t=ts:dt:te;x=exp(-3*t);y=lsim(sys,x,t)y=00.6649-0.0239-0.0630-0.0314-0.0127从（1）（2）对比我们当抽样间隔越小时数值精度越高。专业技术资料整理WORD格式可编辑M3-4x=[0.85,0.53,0.21,0.67,0.84,0.12];kx=-2:3;h=[0.68,0.37,0.83,0.52,0.71];kh=-1:3;y=conv(x,h);k=kx(1)+kh(1):k
