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x=0:pi/10:2*pi; y=2*sin(x); subplot(2,2,1);bar(x,y,'g'); title('bar(x,y,''g'')');axis([0,7,-2,2]); subplot(2,2,2);stairs(x,y,'b'); title('stairs(x,y,''b'')');axis([0,7,-2,2]); subplot(2,2,3);ste

x=0:pi/50:2*pi; y=sin(x); z=cos(x); plot(x,y,'r',x,z,'g'); %绘制两根不同曲线 Hl=get(gca,'Children'); %获取两曲线句柄向量Hl for k=1:size(Hl) if get(Hl(k),'Color')==[0 1 0] %[0 1 0]代表

x=0:pi/100:2*pi; y1=0.2*exp(-0.5*x).*cos(4*pi*x); plot(x,y1) hold on y2=2*exp(-0.5*x).*cos(pi*x); plot(x,y2); hold off

clf; x=-1.5:0.1:1.5; y=x; [X,Y]=meshgrid(x,y); Z=0.5.*(1./sqrt((X-0.5).^2+Y.^2)-0.5).^2.*(X.^2+Y.^2)+0.5.*(X.^2+Y.^2); surf(X,Y,Z) view(-25,25) hold on th=[0:pi/50:2*pi]'; p=1+0.5*cos(th); q

wp = 0.2*pi; ws = 0.3*pi; Rp = 1; As = 15; T = 1; OmegaP = wp/T; OmegaS = ws/T; [cs,ds] = afd_chb1(OmegaP,OmegaS,Rp,As); [b,a] = imp_invr(cs,ds,T); [C,B,A] = dir2par(b,a) [db,mage,pha,grd,w]

wp = 0.2*pi; ws = 0.3*pi; Rp = 1; As = 15; T = 1; Fs = 1/T; OmegaP = (2/T)*tan(wp/2); OmegaS = (2/T)*tan(ws/2); [cs,ds] = afd_chb1(OmegaP,OmegaS,Rp,As); [b,a] = bilinear(cs,ds,Fs); [C,B,A] =

figure('position',[10 10 800 500], 'name','模拟原型低通滤波器'); wq1=uicontrol('style','popupmenu',... 'position',[50 440 250 20],... 'string','Butterworth 低通滤波器|Chebyshev-I低通滤波器'); subplot(1,1,1

wp = 0.2*pi; ws = 0.3*pi; Rp = 1; As = 15; T = 1; OmegaP = wp/T; OmegaS = ws/T; [cs,ds] = afd_elip(OmegaP,OmegaS,Rp,As); [b,a] = imp_invr(cs,ds,T); [C,B,A] = dir2par(b,a) [db,mage,pha,grd,w]

%离散傅里叶变换及x(n),FT[x(n)]的绘图函数 function [c,l]=DFT(x,N,str) n=0:N-1; k=-200:200; w=(pi/100)*k; l=w; c=x*(exp(-j*pi/100)).^(n'*k); %计算DFT[x(n)] magX=abs(c); %幅值 angX=an

b=[1,0];a=[1,-0.9]; [H,w]=freqz(b,a,100); magH=abs(H);phaH=angle(H); subplot(2,1,1); plot(w/pi,magH); grid; xlabel('频率 单位：pi') ylabel('幅度') title('幅度响应'); subplot(2,1,2); plot(w/pi,phaH);g