a1,二维绘图plot的实现
subplot(n,m,x),建立一个m*n的绘图区域，然后分别在其x=1，2，3，4...区域绘制图像。
function [] = plot1() x=0:0.35:7; y=2*exp(-0.5*x); subplot(2,2,1);bar(x,y,'g'); title('bar(x,y,''g'')');axis([0, 7, 0 ,2]); subplot(2,2,2);fill(x,y,'r'); title('fill(x,y,''r'')');axis([0, 7, 0 ,2]); subplot(2,2,3);stairs(x,y,'b'); title('stairs(x,y,''b'')');axis([0, 7, 0 ,2]); subplot(2,2,4);stem(x,y,'k'); title('stem(x,y,''k'')');axis([0, 7, 0 ,2]);绘制的图形如下所示：
bar(x,y,'g'):柱形图
fill(x,y,'r'):填充
stairs(x,y,'b'):梯形图
stem(x,y)：茎状图
2,三维绘图简单应用：
function [] = plotThree() % x=sin(theta),y=cos(theta),z=cos(4*theta) theta = 0:0.01*pi:2*pi; x = sin(theta); y = cos(theta); z = cos(4*theta); subplot(2,2,1); %打开坐标显示 %axis on plot3(x,y,z,'LineWidth',2); hold on; % x=sin(theta),y=cos(theta),z=cos(4*theta) theta = 0:0.02*pi:2*pi; x = sin(theta); y = cos(theta); z = cos(4*theta); subplot(2,2,2); plot3(x,y,z,'rd','MarkerSize',10,'LineWidth',2); % 准备数据 %meshgrid网络点，二维数据 [X,Y] = meshgrid(-1:0.1:1); Z = sin(X.^2.*pi) + cos(Y.*pi); % 设置无限远平行光源光照效果 subplot(2,2,3); %创建一个三维曲面图 surf(X,Y,Z); %在当前坐标区中创建一个光源。光源仅影响补片和曲面图对象。 light('Style','infinit','Position',[0 -0.6 1]); title('无限远平行光') % 设置本地光源辐射源光照效果 subplot(2,2,4); surf(X,Y,Z); light('Style','local','Position',[0 -0.6 1]); title('本地辐射光')显示如下：
3,三维图绘画：
function [] = plotshere() [x,y,z] = sphere(25); subplot(3,4,1);surf(x,y,z); axis equal;shading interp; hold on; title('lighting none') subplot(3,4,2);surf(x,y,z); axis equal; light('position',[0,0.5 1]); shading interp;lighting flat; hold on; title('lighting flat'); subplot(3,4,3);surf(x,y,z); axis equal; light('position',[0,0.5 1]); shading interp;lighting gouraud; hold on; title('lighting gouraud'); subplot(3,4,4);surf(x,y,z); axis equal; light('position',[0,0.5 1]); shading interp;lighting phong; hold on; title('lighting phong'); subplot(3,4,5); set(gcf,'color','w'); sphere(25); axis vis3d h = light; for az = -50:10:50 lightangle(h,az,30) pause(.2) end t = 0:pi/10:2*pi; [X1,Y1,Z1] = cylinder(2 + cos(t)); subplot(3,4,6);surf(X1,Y1,Z1) axis square;title('三维柱面图'); subplot(3,4,7);sphere axis equal;title('三维球体'); x1 = [1 3 0.5 2.5 2]; explode = [0 1 0 0 0]; subplot(3,4,8);pie3(x1,explode) title('三维饼图');axis equal; X2 = [0 1 1 2;1 1 2 2;0 0 1 1]; Y2 = [1 1 1 1;1 0 1 0;0 0 0 0]; Z2 = [1 1 1 1;1 0 1 0;0 0 0 0]; C = [0.5000 1.0000 1.0000 0.5000; 1.0000 0.5000 0.5000 0.1667; 0.3330 0.3330 0.5000 0.5000]; subplot(3,4,9);fill3(X2,Y2,Z2,C); colormap hsv title('三维填充图');axis equal; [x2,y2] = meshgrid(-3:.5:3,-3:.1:3); z2 = peaks(x2,y2); subplot(3,4,10);ribbon(y2,z2) colormap hsv title('三维彩带图');axis equal; [X3,Y3] = meshgrid(-2:0.25:2,-1:0.2:1); Z3 = X3 .* exp(-X3.^2 - Y3.^2); [U,V,W] = surfnorm(X3,Y3,Z3); subplot(3,4,11);quiver3(X3,Y3,Z3,U,V,W,0.5); hold on surf(X3,Y3,Z3); colormap hsv view(-35,45); title('三维向量场图');axis equal; set(gcf,'Color','w'); [x y z v] = flow; h = contourslice(x,y,z,v,[1:9],[],[0],linspace(-8,2,10)); subplot(3,4,12); axis([0,10,-3,3,-3,3]);daspect([1,1,1]) camva(24); camproj perspective; campos([-3,-15,5]) set(gcf,'Color',[.5,.5,.5],'Renderer','zbuffer') %set(gca,'Color','black','XColor','white','YColor','white','Zcolor','white') box on