matlab程序图————————————————————————————————作者:————————————————————————————————日期: 加入随机信号的正弦周期波%program2_1_2sinusoidalsignalwithrandomsignalt=(0::50);y=sin(2*pi*50*t);s=y+randn(size(t));plot(t(1:50),s(1:50))正弦波信号%program2_1_1sinusoidalsignalt=(0::50);y=sin(2*pi*50*t);plot(t(1:50),y(1:50))指数信号%program2_1_3exponentialsignalA=2;a=;t=0::20;y=A*exp(a*t);plot(t,y)方波信号%program2_1_4periodicsquaresignalt=(0::);y=square(2*pi*30*t);plot(t(1:50),y(1:50))周期锯齿波%program2_1_5periodicsawtoothsignalt=(0::);w=60*pi;y=sawtooth(w*t);plot(t,y),axis([-11])取样函数%program2_1_6periodicsawtoothsignalx=linspace(-5,5);y=sinc(x);plot(x,y)微分%program2_1_8h=;t=0:h:4;x=sinc(t);y1=diff(x)*1/h;plot(t(1:length(t)-1),y1)title('dSa(t)/dt')积分%program2_1_9t=0::4;form=1:length(t)y2(m)=quad('sinc',0,t(m));endplot(t,y2)title('integralofSa(t)')
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