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%使用几种命令绘制离散数据 x=0:0.1:2*pi; y=sin(x).*exp(-2*x); subplot(3,1,1) stem(x,y,'filled') %画火柴杆图 subplot(3,1,2) stairs(x,y) %画阶梯图 subplot(3,1,3) scatter(x,y) %画点图

%求符号表达式的积分 f=sym('cos(x)'); int(f) %求不定积分 int(f,0,pi/3) %求定积分 int(f,'a','b') %求定积分 int(int(f)) %求多重积分 syms t x g=[2*x t^2;t*sin(x) exp(x)] %创建符号矩阵 int(g) %对x求不定积分 int(g,'t') %对t求不定积分

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)

% 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

%-------------------------------------------------------------------------- % example6_20; % to test buttord.m and butter.m; % to design a Butterworth Bandpass digital filter. % ------------------

n=-5:10; x=sin(pi*n/2); k=-100:100;w=pi/100*k; X=x*(exp(-j*pi/100)).^(n'*k); [xe,xo,m]=evenodd(x,n); XE=xe*(exp(-j*pi/100)).^(m'*k); XO=xo*(exp(-j*pi/100)).^(m'*k); XR=real(X); error1=max(abs(

x=linspace(0,2*pi,30); y=sin(x); z=cos(x); plot(x,y,'--',x,z,':'); grid xlabel('x') ylabel('y') title('正弦及余弦曲线')