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ButtonName=questdlg('What is your class?','your class', '2006','2005','2004','2003'); switch ButtonName, case '2006' disp('one'); case '2005' disp('two') case '2004',

t=(0:127)/128*2*pi;r=ones(size(t)); x=cos(t);y=sin(t);f=abs(fft(ones(10,1),128));r=ones(size(t))+f'; stem3(x,y,f','d','filled')

ErrorString='The data is wrong.'; DlgName='error'; CREATEMODE='none'; errordlg(ErrorString,DlgName,CREATEMODE)

p=get(h_fig,'position') % 获取h_fig图形对象位置属性 c=get(h_fig,'color') % 获取h_fig图形对象颜色属性 set(h_fig,'color','w') %将图形窗口的背景色改为白色

subplot(2,2,1); ezpolar('3*theta');title('1') subplot(2,2,2); ezpolar('theta/4');title('2') subplot(2,2,3); ezpolar('exp(2*theta)');title('3') subplot(2,2,4); ezpolar('exp(2*theta)');title('4')

x=0:0.15:2*pi;y=0:0.15:2*pi;z=sin(y')*cos(x); mesh(x,y,z); xlabel('x-axis'),ylabel('y-axis'),zlabel('z-label');title('3-D mesh ');

figure [X,cmap]=imread('C:\MATLAB7\toolbox\images\imdemos\trees.tif'); %图像文件trees.tif读入工作空间变量X中 image(X); colormap(cmap); %显示数据存放矩阵X的图像 imwrite(X,'ff.jpg','Quality',100) ; %

%方法1： x=-1:0.05:1;y=x; [x,y]=meshgrid(x,y); z=x.^2+2*y.^2; surf(x,y,z) %方法2： syms x y;f=x^2+y^2;ezsurf(f)% -2 ≤x≤2 ,-2 ≤y≤2 %方法3： ezsurf('x','y','x^2+y^2',[-1,1,-1,1])% -1≤x≤1,-1≤y≤1

hf=figure('Color',[0,1,1],'Position',[100,200,200,300],'Name','This is a three dimentional figure.','NumberTitle','off','MenuBar','none'); uicontrol(hf,'Style','Text', 'Units','normalized', 'Position

x=0:0.1:2*pi;[x,y]=meshgrid(x);z=sin(y).*cos(x); [I,J]=find(z>0.35); for ii=1:length(I) z(I(ii),J(ii))=NaN; end surf(x,y,z)