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[ÇóÖú] Çó´óÉñ½âÊÍ~~F=@(p,x)p(1)*x(:,1).^2+p(2)*x(:,1).*x(:,2)+p(3)*x(:,2).^2+p(4); ÒÑÓÐ1È˲ÎÓë

F=@(p,x)p(1)*x(:,1).^2+p(2)*x(:,1).*x(:,2)+p(3)*x(:,2).^2+p(4);
% ÀëÉ¢Êý¾Ýµã
x=load('G:\Users\Daniel\Desktop\Total.txt');
p0=[1 1 1 1];
warning off
% ÄâºÏϵÊý,×îС¶þ³Ë·½·¨
p=nlinfit(x,zeros(size(x,1),1),F,p0);
plot(x(:,1),x(:,2),'r.');
axis square;
hold on;
xmin=min(x(:,1));
xmax=max(x(:,1));
ymin=min(x(:,2));
ymax=max(x(:,2));
% ×÷ͼ
ezplot(@(x,y)F(p,[x,y]),[-1+xmin,1+xmax,-1+ymin,1+ymax]);
title('ÇúÏßÄâºÏ');
legend('Ñù±¾µã','ÄâºÏÇúÏß')
set(gca,'xtick',[-1:0.2:1]);
set(gca,'ytick',[-1:0.2:1]);
xlim([-1 1]);
ylim([-1 1]);
line([-1 1],[0 0]);
line([0 0],[-1 1]);

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F=@(p,x)p(1)*x(:,1).^2+p(2)*x(:,2).^2+p(3)%ÄäÃûº¯Êýд³ÉÕâ¸ö

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p0 = [1 1 1];

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Çó´óÉñ½âÊÍ~~F=@(p,x)p(1)*x(:,1).^2+p(2)*x(:,1).*x(:,2)+p(3)*x(:,2).^2+p(4);
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