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%用ezplot3将符号表达式三维图形化 x=sym('sin(t)'); z=sym('t'); y=sym('cos(t)'); ezplot3(x,y,z,[0,10*pi],'animate') %绘制t在[0,10*pi]范围的三维曲线

function Ex0802 % Ex0802 绘制正弦信号波形 x=0:0.1:2*pi; y=sin(x); plot(x,y)

clc clear fs=512; m=0:(fs-1); xn=sqrt(20)*sin(2*pi*0.2*m)+sqrt(2)*sin(2*pi*0.213*m)+randn(1,fs); %产生含有噪声的序列xn %取阵元数量为M; %取快拍次数为N; M=50; N=50; %求x(n)矩阵,取每相邻两个阵元在同一时间内接收的信号正好相差一个采样间隔 x=zer

% example 7 x=linspace(0,2*pi,30); y=sin(x); z=cos(x); plot(x,y,x,z);

f0=50;T=1/f0; N=16; t=T:T:N*T; x=sin(2*pi*t); x subplot(3,2,1); stem(t,x); X=dft(x,N); magX=abs(X); f=1./t; subplot(3,2,2); stem(f,magX);grid; title('fs=50Hz'); f1=100;T1=1/f1; t1=T1

n=[0:11]; x=cos(n*pi/6); k=-200:200;w=(pi/100)*k; X=x*exp(-j*pi/100.*(n'*k));%用矩阵的变换完成对序列x的DTFT，取两百个点观察 magX=abs(X);angX=angle(X); subplot(211);plot(w/pi,magX);grid; title('幅频响应'); xlabel('Freq

f0=50;T=1/f0; N=16; t=T:T:N*T; x=sin(2*pi*t); subplot(3,2,1); stem(t,x); X=dft(x,N); magX=abs(X); f=1./t; subplot(3,2,2); stem(f,magX);grid; title('fs=50Hz'); f1=100;T1=1/f1; t1=T1:T1

b=[1,1]; a=[1,0.9,-0.81];% [H,w]=freqz(b,a,100); magH=abs(H);phaH=angle(H); subplot(211);plot(w/pi,magH);grid; title('系统函数H的幅频曲线'); xlabel('freq');ylabel('amp'); subplot(212);plot(w/pi,phaH/pi)

b=[0,1,1]; a=[1,-0.9,0.81]; [R,p,C]=residuez(b,a) Mp=abs(p') Ap=angle(p')/pi

% example 13 x=linspace(0,2*pi,30); y=sin(x); z=cos(x); a=2*sin(x).*cos(x); b=sin(x)./(cos(x)+eps); h1=figure; plot(x,y);axis([0 2*pi -1 1]),title('sin(x)'); h2=figure; plot(x,z);axis([0 2*pi