view(-5,10) drawnow end
实例30：立体透视（2） function shili30
h0=figure('toolbar','none',...
'position',[200 150 450 250],... 'name','实例30'); [x,y,z]=meshgrid(-2:0.1:2,...
-2:0.1:2,... -2:0.1:2);
v=x.*exp(-x.^2-y.^2-z.^2); [dx,dy,dz]=cylinder; slice(x,y,z,v,[-2 2],2,-2) for i=-2:0.2:2
h=surface(dx+i,dy,dz); rotate(h,[1 0 0],90) xp=get(h,'xdata'); yp=get(h,'ydata'); zp=get(h,'zdata'); delete(h) hold on hs=slice(x,y,z,v,xp,yp,zp); axis tight xlim([-3 3]) view(-10,35) drawnow delete(hs)
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hold off
end
实例31：表面图形 function shili31
h0=figure('toolbar','none',...
'position',[200 150 550 250],... 'name','实例31'); subplot(1,2,1) x=rand(100,1)*16-8; y=rand(100,1)*16-8; r=sqrt(x.^2+y.^2)+eps; z=sin(r)./r;
xlin=linspace(min(x),max(x),33); ylin=linspace(min(y),max(y),33); [X,Y]=meshgrid(xlin,ylin); Z=griddata(x,y,z,X,Y,'cubic'); mesh(X,Y,Z) axis tight hold on
plot3(x,y,z,'.','Markersize',20) subplot(1,2,2) k=5; n=2^k-1;
theta=pi*(-n:2:n)/n; phi=(pi/2)*(-n:2:n)'/n; X=cos(phi)*cos(theta); Y=cos(phi)*sin(theta); Z=sin(phi)*ones(size(theta));
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/4.txt[2010/5/14 1:14:30]
colormap([0 0 0;1 1 1]) C=hadamard(2^k); surf(X,Y,Z,C) axis square
实例32：沿曲线移动的小球 h0=figure('toolbar','none',...
'position',[198 56 408 468],... 'name','实例32'); h1=axes('parent',h0,... 'position',[0.15 0.45 0.7 0.5],... 'visible','on'); t=0:pi/24:4*pi; y=sin(t); plot(t,y,'b') n=length(t);
h=line('color',[0 0.5 0.5],...
'linestyle','.',... 'markersize',25,... 'erasemode','xor'); k1=uicontrol('parent',h0,...
'style','pushbutton',... 'position',[80 100 50 30],... 'string','开始',... 'callback',[...
'i=1;',... 'k=1;,',... 'm=0;,',... 'while 1,',...
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/4.txt[2010/5/14 1:14:30]
'if k==0,',... 'break,',... 'end,',... 'if k~=0,',... 'set(h,''xdata'',t(i),''ydata'',y(i)),',... 'drawnow;,',... 'i=i+1;,',... 'if i>n,',... 'm=m+1;,',... 'i=1;,',... 'end,',... 'end,',... 'end']); k2=uicontrol('parent',h0,...
'style','pushbutton',... 'position',[180 100 50 30],... 'string','停止',... 'callback',[...
'k=0;,',...
'set(e1,''string'',m),',... 'p=get(h,''xdata'');,',... 'q=get(h,''ydata'');,',... 'set(e2,''string'',p);,',... 'set(e3,''string'',q)']); k3=uicontrol('parent',h0,...
'style','pushbutton',... 'position',[280 100 50 30],... 'string','关闭',... 'callback','close');
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/4.txt[2010/5/14 1:14:30]
e1=uicontrol('parent',h0,... 'style','edit',...
'position',[60 30 60 20]); t1=uicontrol('parent',h0,...
'style','text',... 'string','循环次数',... 'position',[60 50 60 20]); e2=uicontrol('parent',h0,...
'style','edit',... 'position',[180 30 50 20]); t2=uicontrol('parent',h0,... 'style','text',...
'string','终点的X坐标值',... 'position',[155 50 100 20]); e3=uicontrol('parent',h0,... 'style','edit',... 'position',[300 30 50 20]); t3=uicontrol('parent',h0,... 'style','text',...
'string','终点的Y坐标值',... 'position',[275 50 100 20]);
实例33：曲线转换按钮 h0=figure('toolbar','none',...
'position',[200 150 450 250],... 'name','实例33'); x=0:0.5:2*pi; y=sin(x); h=plot(x,y);
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/4.txt[2010/5/14 1:14:30]