MATLAB教程 数据和函数的可视化 示例.doc

MATLAB教程 数据和函数的可视化 示例所有算例都是运行实例，易于读者实践实验，并从中掌握一 离散数据和离散函数的可视化绘制四种三维图x,y=meshgrid(-8:0.5:8); z=sin(sqrt(x.2+y.2)./sqrt(x.2+y.2+eps); subplot(2,2,1); mesh(x,y,z); title(mesh(x,y,z) subplot(2,2,2); meshc(x,y,z); title(meshc(x,y,z) subplot(2,2,3); meshz(x,y,z) title(meshz(x,y,z) subplot(2,2,4); surf(x,y,z); title(surf(x,y,z) 绘制标准三维曲面图形。程序如下：t=0:pi/20:2*pi; x,y,z= cylinder(2+sin(t),30); subplot(2,2,1); surf(x,y,z); subplot(,2,2); x,y,z=sphere; surf(x,y,z); subplot(2,1,2); x,y,z=peaks(30); surf(x,y,z)例 用图形表示离散y= |n|。本例演示：自变量的适当选取；图形的适当比例。见图1.1 n=(-10:10); %产生一组自变量数据y=abs(n); %函数的数组算法计算相应点的函数值plot(n,y,r.,MarkerSize,20)axis equalgrid on %画坐标格xlabel(n) 图 5.1-1 离散函数的可视化 contour 美丽的图案t=linspace(0,2*pi,61);r=0:0.05:1; tt,rr=meshgrid(t,r); xx,yy=pol2cart(tt,rr); zz=xx+sqrt(-1)*yy; ff=abs(zz.3-1); contour(xx,yy,ff,50);axis image matlab封面图x,y,z=peaks;meshc(x,y,z);axis tight 宝石项链cleart=(0:0.02:2)*pi;x=sin(t);y=cos(t);z=cos(2*t); % 三维曲线的参数方程plot3(x,y,z,b-,x,y,z,bd)view(-82,58),box onxlabel(x),ylabel(y),zlabel(z)legend(链,宝石,Location,best) 画极坐标曲线ezpolar(sin(tan(t) 透视圆演示X0,Y0,Z0=sphere(30); X=2*X0;Y=2*Y0;Z=2*Z0; surf(X0,Y0,Z0); shading interp hold on,mesh(X,Y,Z),colormap(hot) hold off hidden off axis equal,axis off 圆同心load(topo.mat,topo,topomap1);x,y,z = sphere(50);props.FaceColor= texture;props.EdgeColor = none;surface(x,y,z,props);axis square off浓淡处理clf % 清空图形窗x= -4:4;y=x;X,Y=meshgrid(x,y);Z=X.2+Y.2;surf(X,Y,Z)colormap(jet)subplot(1,3,1),surf(Z),axis offsubplot(1,3,2),surf(Z),axis off,shading flatsubplot(1,3,3),surf(z),axis off,shading interpset(gcf,Color,w) %设置图形窗的底色为白色彩的变幻2 ezsurf(x*y,circ);shading flat;view(-18,28); C=summer; CC=C;flipud(C); colormap(CC) spinmap(30,4)透明度控制clf surf(peaks) shading interp alpha(0.5) colormap(summer)切片图x,y,z = meshgrid(-2:.2:2,-2:.25:2,-2:.16:2);v = x.*exp(-x.2-y.2-z.2);xslice = -1.2,.8,2; yslice = 2; zslice = -2,0;slice(x,y,z,v,xslice,yslice,zslice)colormap hsv 彩带图x,y=meshgrid(-3:.5:3,-3:.1:3);z=peaks(x,y);ribbon(y,z)双叶图ezsurf(8*tan(u)*cos(v),8.*tan(u)*sin(v),2.*sec(u),-pi./2,3*pi./2,0,2*pi) axis equal grid on