X~2分布、t分布和f分布的性质及近似计算.doc

以下为三个分布的动画演示程序，直接运行： function dandn(action) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % %???????????? 《X~2分布、t分布和f分布的性质及近似计算》 % %?????????????????? 制作人： 幸玮 石岩 顾秋容 % All Rights Reserved %?????????????????????????? 2008.12 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %无输入参数时进行初始程序,否则调界面参数 if nargin1, action=initialize; else %看是哪种分布 data=get(gco,UserData); pdflabel=data(4); %图形显示参数，调试时用 switch pdflabel case 1 xstart=0; %x轴起始点 width=120; %x轴范围 xdis=30; %x轴刻度间距 lenth=0.24; %y轴范围 ydis=0.03; %y轴刻度间距 speed=0.6; %动画演进速率 case 2 width=6; xdis=3; lenth=0.42; ydis=0.05; speed=0.5; case 3 width=2; xdis=0.5; lenth=4; ydis=0.4; speed=0.8; end end %初始化模块 if strcmp(action,initialize) %数据初始化 %分布函数选择 pdflabel=0; d=inputdlg({输入分布函数类型:},选择分布函数,1,{x2}); if strcmp(d,x2) pdflabel=1; elseif strcmp(d,t) pdflabel=2; elseif strcmp(d,f) pdflabel=3; end %不符合的输入报错 if pdflabel==0 errordlg(分布函数只能选择x2,t与f) return end %整体用户界面建立，图形显示窗口嵌入 figNumber=figure( ... Name,Changing of the X~2 destribution function, ... NumberTitle,off, ... Visible,off); axes( ... Units,normalized, ... Visible,off, ... Position,[0.06 0.065 0.70 0.9]); %显示初始现实画面 switch pdflabel case 1 %初始显示参数 xstart=0; %x轴起始点 width=120; %x轴范围 xdis=30; %x轴刻度间距 lenth=0.24; %y轴范围 ydis=0.03; %y轴刻度间距 %画背景图 plot([xstart xstart+width],[lenth lenth],