'linewidth',3) hold off
set(gca,'xtick',[91:95])
set(gca,'layer','top') gtext('\\leftarrow第一季度销量') gtext('\\leftarrow第二季度销量') gtext('\\leftarrow第三季度销量') gtext('\\leftarrow第四季度销量') xlabel('年','fontsize',16); ylabel('销售量','fontsize',16);
实例9：饼图的绘制 function shili09
h0=figure('toolbar','none',...
'position',[200 150 450 250],... 'name','实例09'); t=[54 21 35;
68 54 35; 45 25 12; 48 68 45; 68 54 69]; x=sum(t); h=pie(x); textobjs=findobj(h,'type','text'); str1=get(textobjs,{'string'}); val1=get(textobjs,{'extent'}); oldext=cat(1,val1{:}); names={'商品一：';'商品二：';'商品三：'}; str2=strcat(names,str1);
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/1.txt[2010/5/14 1:14:29]
set(textobjs,{'string'},str2) val2=get(textobjs,{'extent'}); newext=cat(1,val2{:});
offset=sign(oldext(:,1)).*(newext(:,3)-oldext(:,3))/2; pos=get(textobjs,{'position'}); textpos=cat(1,pos{:}); textpos(:,1)=textpos(:,1)+offset; set(textobjs,{'position'},num2cell(textpos,[3,2]))
实例10：阶梯图 function shili10
h0=figure('toolbar','none',...
'position',[200 150 450 400],... 'name','实例10'); a=0.01; b=0.5; t=0:10;
f=exp(-a*t).*sin(b*t); stairs(t,f) hold on plot(t,f,':*') hold off
glabel='函数e^{-(\\alpha*t)}sin\\beta*t的阶梯图'; gtext(glabel,'fontsize',16) xlabel('t=0:10','fontsize',16) axis([0 10 -1.2 1.2])
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/1.txt[2010/5/14 1:14:29]
实例11：枝干图 function shili11
h0=figure('toolbar','none',...
'position',[200 150 450 350],... 'name','实例11'); x=0:pi/20:2*pi; y1=sin(x); y2=cos(x); h1=stem(x,y1+y2); hold on
h2=plot(x,y1,'^r',x,y2,'*g'); hold off h3=[h1(1);h2];
legend(h3,'y1+y2','y1=sin(x)','y2=cos(x)') xlabel('自变量X');
ylabel('函数值Y'); title('正弦函数与余弦函数的线性组合');
实例12：罗盘图 function shili12
h0=figure('toolbar','none',...
'position',[200 150 450 250],... 'name','实例12'); winddirection=[54 24 65 84
256 12 235 62 125 324 34 254]; windpower=[2 5 5 3
6 8 12 7 6 14 10 8];
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/2.txt[2010/5/14 1:14:29]
rdirection=winddirection*pi/180; [x,y]=pol2cart(rdirection,windpower); compass(x,y); desc={'风向和风力', '北京气象台', '10月1日0：00到', '10月1日12：00'}; gtext(desc)
实例13：轮廓图 function shili13
h0=figure('toolbar','none',...
'position',[200 150 450 250],... 'name','实例13'); [th,r]=meshgrid((0:10:360)*pi/180,0:0.05:1); [x,y]=pol2cart(th,r); z=x+i*y;
f=(z.^4-1).^(0.25); contour(x,y,abs(f),20) axis equal
xlabel('实部','fontsize',16); ylabel('虚部','fontsize',16); h=polar([0 2*pi],[0 1]); delete(h) hold on contour(x,y,abs(f),20)
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/2.txt[2010/5/14 1:14:29]
实例14：交互式图形 function shili14
h0=figure('toolbar','none',...
'position',[200 150 450 250],... 'name','实例14'); axis([0 10 0 10]); hold on x=[]; y=[]; n=0;
disp('单击鼠标左键点取需要的点'); disp('单击鼠标右键点取最后一个点'); but=1; while but==1
[xi,yi,but]=ginput(1); plot(xi,yi,'bo') n=n+1;
disp('单击鼠标左键点取下一个点'); x(n,1)=xi; y(n,1)=yi; end t=1:n; ts=1:0.1:n; xs=spline(t,x,ts); ys=spline(t,y,ts); plot(xs,ys,'r-'); hold off
实例14：交互式图形
file:///E|/Document/发展篇/M&M/竞赛篇/常用算法/matlab 实例/2.txt[2010/5/14 1:14:29]