[注意] 小程序

1-32是：图形应用篇

33-66是：界面设计篇

67-84是：图形处理篇

85-100是：数值分析篇

实例1：三角函数曲线（1）

function shili01
h0=figure('toolbar','none',...
    'position',[198 56 350 300],...
    'name','实例01');
h1=axes('parent',h0,...
   'visible','off');
x=-pi:0.05:pi;
y=sin(x);
plot(x,y);
xlabel('自变量X');
ylabel('函数值Y');
title('SIN( )函数曲线');
grid on

实例2：三角函数曲线（2）

function shili02
h0=figure('toolbar','none',...
'position',[200 150 450 350],...
'name','实例02');
x=-pi:0.05:pi;
y=sin(x)+cos(x);
plot(x,y,'-*r','linewidth',1);
grid on
xlabel('自变量X');
ylabel('函数值Y');
title('三角函数');
实例3：图形的叠加

function shili03
h0=figure('toolbar','none',...
    'position',[200 150 450 350],...
    'name','实例03');
x=-pi:0.05:pi;
y1=sin(x);
y2=cos(x);
plot(x,y1,...
    '-*r',...
    x,y2,...
    '--og');
grid on
xlabel('自变量X');
ylabel('函数值Y');
title('三角函数');
实例4：双y轴图形的绘制

function shili04
h0=figure('toolbar','none',...
'position',[200 150 450 250],...
'name','实例04');
x=0:900;a=1000;b=0.005;
y1=2*x;
y2=cos(b*x);
[haxes,hline1,hline2]=plotyy(x,y1,x,y2,'semilogy','plot');
axes(haxes(1))
ylabel('semilog plot');
axes(haxes(2))
ylabel('linear plot');
实例5：单个轴窗口显示多个图形

function shili05
h0=figure('toolbar','none',...
'position',[200 150 450 250],...
'name','实例05');
t=0:pi/10:2*pi;
[x,y]=meshgrid(t);
subplot(2,2,1)
plot(sin(t),cos(t))
axis equal

subplot(2,2,2)
z=sin(x)-cos(y);
plot(t,z)
axis([0 2*pi -2 2])

subplot(2,2,3)
h=sin(x)+cos(y);
plot(t,h)
axis([0 2*pi -2 2])

subplot(2,2,4)
g=(sin(x).^2)-(cos(y).^2);
plot(t,g)
axis([0 2*pi -1 1])
实例6：图形标注

function shili06
h0=figure('toolbar','none',...
    'position',[200 150 450 400],...
    'name','实例06');
t=0:pi/10:2*pi;
h=plot(t,sin(t));
xlabel('t=0到2\pi','fontsize',16);
ylabel('sin(t)','fontsize',16);
title('\it{从 0to2\pi 的正弦曲线}','fontsize',16)
x=get(h,'xdata');
y=get(h,'ydata');
imin=find(min(y)==y);
imax=find(max(y)==y);
text(x(imin),y(imin),...
    ['\leftarrow最小值=',num2str(y(imin))],...
    'fontsize',16)
text(x(imax),y(imax),...
    ['\leftarrow最大值=',num2str(y(imax))],...
    'fontsize',16)

实例7：条形图形

function shili07
h0=figure('toolbar','none',...
'position',[200 150 450 350],...
'name','实例07');
tiao1=[562 548 224 545 41 445 745 512];
tiao2=[47 48 57 58 54 52 65 48];
t=0:7;
bar(t,tiao1)
xlabel('X轴');
ylabel('TIAO1值');
h1=gca;
h2=axes('position',get(h1,'position'));
plot(t,tiao2,'linewidth',3)
set(h2,'yaxislocation','right','color','none','xticklabel',[])
实例8：区域图形

function shili08
h0=figure('toolbar','none',...
    'position',[200 150 450 250],...
    'name','实例08');
x=91:95;
profits1=[88 75 84 93 77];
profits2=[51 64 54 56 68];
profits3=[42 54 34 25 24];
profits4=[26 38 18 15 4];
area(x,profits1,'facecolor',[0.5 0.9 0.6],...
    'edgecolor','b',...
    'linewidth',3)
hold on
area(x,profits2,'facecolor',[0.9 0.85 0.7],...
    'edgecolor','y',...
    'linewidth',3)
hold on
area(x,profits3,'facecolor',[0.3 0.6 0.7],...
    'edgecolor','r',...
    'linewidth',3)
hold on
area(x,profits4,'facecolor',[0.6 0.5 0.9],...
    'edgecolor','m',...
    '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);
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])
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];
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)
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

function shili15
h0=figure('toolbar','none',...
    'position',[200 150 450 250],...
    'name','实例15');
axis equal
m=moviein(20,gcf);
set(gca,'nextplot','replacechildren')
h=uicontrol('style','slider','position',...
    [100 10 500 20],'min',1,'max',20)
for j=1:20
    plot(fft(eye(j+16)))
    set(h,'value',j)
    m(:,j)=getframe(gcf);
end
clf;
axes('position',[0 0 1 1]);
movie(m,30)
实例16：劳伦兹非线形方程的无序活动

function shili17
h0=figure('toolbar','none',...
    'position',[200 150 450 250],...
    'name','实例17');
t=(1:2:15)*pi/8;
x=sin(t);
y=cos(t);
fill(x,y,'r')
axis square off
text(0,0,'STOP',...
    'color',[1 1 1],...
    'fontsize',50,...
    'horizontalalignment','center')
例18：条形图和阶梯形图

(责任编辑：泉水)

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[注意] 小程序