【數學建模】基於matlab GUI最小二乘法曲線擬合【含Matlab原始碼 492期】
阿新 • • 發佈：2021-06-28
一、簡介
最小化二乘法是一種數學優化技術，是一種最簡單的優化問題。
1 原理
2 方法
3 例項
二、原始碼
clf; set(gcf,'Unit','normalized','Position',[0.2,0.3,0.60,0.45]); set(gcf,'Menubar','none','Name','最小二乘法曲線擬合','NumberTitle','off'); axes('Position',[0.05,0.1,0.55,0.85]); uicontrol(gcf,'Style','text', 'Unit','normalized',... 'Posi',[0.63,0.875,0.15,0.05],'String',... '輸入x向量：','FontSize',11,'Horizontal','center','BackgroundColor',[0.8 0.8 0.8]); hedit1=uicontrol(gcf,'Style','edit','Unit','normalized',... 'Posi',[0.63,0.8,0.35,0.075],'Max',1); uicontrol(gcf,'Style','text', 'Unit','normalized',... 'Posi',[0.63,0.7,0.15,0.05],'String',... '輸入y向量：','FontSize',11,'Horizontal','center','BackgroundColor',[0.8 0.8 0.8]); hedit2=uicontrol(gcf,'Style','edit','Unit','normalized',... 'Posi',[0.63,0.625,0.35,0.075],'Max',1); uicontrol(gcf,'Style','text', 'Unit','normalized',... 'Posi',[0.63,0.525,0.15,0.05],'String',... '輸入xi向量：','FontSize',11,'Horizontal','center','BackgroundColor',[0.8 0.8 0.8]); hedit3=uicontrol(gcf,'Style','edit','Unit','normalized',... 'Posi',[0.63,0.45,0.35,0.075],'Max',1); hpush1=uicontrol(gcf,'Style','push','Unit','normalized',... 'Posi',[0.63,0.3,0.25,0.1],'String',... '繪製原始資料曲線','FontSize',11,'Call',... 'x=str2num(get(hedit1,''String''));y=str2num(get(hedit2,''String''));plot(x,y,'':o'');'); hpush2=uicontrol(gcf,'Style','push','Unit','normalized',... 'Posi',[0.63,0.175,0.2,0.1],'String',... '繪製擬合曲線','FontSize',11,'Call',... 'hold on;x=str2num(get(hedit1,''String''));y=str2num(get(hedit2,''String''));xi=str2num(get(hedit3,''String''));p=polyfit(x,y,2);yi=polyval(p,xi);plot(xi,yi,''r-*'');hold off'); hpush3=uicontrol(gcf,'Style','push','Unit','normalized',...
三、執行結果
四、備註
版本：2014a
完整程式碼或代寫加1564658423