Matlab中的绘图工具.ppt

MatLab 绘图,二维图形命令Plot的用法,以下的全部内容可以直接拷贝运行. plot(y) -打印2维图 例如： y =peaks plot(y) x =-2*pi:0.1*pi:2*pi y =sin(x) plot(y),Plot(x,y),x =-2*pi:0.1*pi:2*pi y=sin(x).*x plot(x,y),指定各种线型,指定各种标志点,指定线或点的颜色,2维绘图(实例),t = 0:pi/20:2*pi; plot(t,sin(t),-.r*) hold on plot(sin(t-pi/2),-mo) plot(sin(t-pi),:bs) hold off,创建多窗口subplot,income = 3.2 4.1 5.0 5.6; outgo = 2.5 4.0 3.35 4.9; subplot(2,1,1); plot(income) subplot(2,1,2); plot(outgo),显示图象,X1,map1=imread(forest.tif); X2,map2=imread(trees.tif); subplot(1,2,1), imshow(X1,map1) subplot(1,2,2), imshow(X2,map2) 或者用subimage函数显示图象,函数打印,fplot(tanh,-2 2),其目的是快速地打印出一个已知或自定义的函数图形，默认的范围是-2pi,2pi,打印自定义函数,function Y = myfun(x) Y(:,1) = 200*sin(x(:)./x(:); Y(:,2) = x(:).2;,自定义一个函数myfun，保存在硬盘上的名字为myfun.m,fplot(myfun,-20 20,subplot(2,2,1);fplot(humps,0 1) subplot(2,2,2);fplot(abs(exp(-j*x*(0:9)*ones(10,1),0 2*pi) subplot(2,2,3);fplot(tan(x),sin(x),cos(x),2*pi*-1 1 -1 1) subplot(2,2,4);fplot(sin(1./x),0.01 0.1,1e-3),在撰写论文的过程中，经常需要在一个图中包含多个子图，上面包含了4个图,ezplot(f) ezplot(f,min,max),ezplot(x2-y4) -2Pi, 2Pi ezplot(x2-y4,0,1,0,1),一种更简单的处理函数图形的方法,通过图形采样,x,y = ginput(10),打印3D线图-Plot3(x,y,z),t = 0:pi/50:10*pi; plot3(sin(t),cos(t),t) grid on axis square,张成网格 meshgrad,X,Y = meshgrid(-8:.5:8); R = sqrt(X.2 + Y.2) + eps;,3D网格图 mesh,Z = sin(R)./R; mesh(Z),另外一个3D网格图函数 Surf(z),Z =peaks surf(Z) X,Y,Z = peaks(30); surfc(X,Y,Z) colormap hsv axis(-3 3 -3 3 -10 5),一个立体球-sphere,k = 5; n = 2k-1; x,y,z = sphere(n); c = hadamard(2k); surf(x,y,z,c); colormap(1 1 0; 0 1 1) axis equal,Meshc surfc,增加一个参考平面 meshc(peaks) meshz(peaks),换个角度看3D图形,view(1,2,3) 看一看隐藏的东西 hidden,3D柱状体cylinder,t = 0:pi/10:2*pi; X,Y,Z = cylinder(2+cos(t); surf(X,Y,Z) axis square,Y = round(rand(5,3)*10); subplot(2,2,1) bar(Y,group) title Group subplot(2,2,2) bar(Y,stack) title Stack subplot(2,2,3) barh(Y,stack) title Stack subplot(2,2,4) bar(Y,1.5) title Width = 1.5,条状图函数Bar,饼图,x = 1 3 0.5 2.5 2; explode = 0 1 0 0 0; pie(x,explode) colormap （jet autumn spring。）,三维饼图,pie3(x,explode),Z =f(x,y)的图象,x =-3:0.05:3 y =-3:0.05:3 X1,Y1 =meshgrid(x,y) z =0.1*sin(X1.2+Y1.2) mesh(x,y,z),图形标注,Label(x) ylabel(y) title(标题) legend(sin, cos, tan),添加浮动标签,x =-10:0.1:10 plot(x,sin(x),r+,x,cos(x),bD) legend(sin,