2021-04-26 Matlab fitting

image.png

x=[-1.2 -1.5 0.3 0.9 1.8 2.6 3.0 3.5 5.0 8.0];
y=[-15.6 -8.5 2.2 4.5 6.6 8.2 8.9 10.0 13.2 19.4];

figure('Position',[50 50 1500 400]);

for i=1:3
    subplot(1,3,i); 
    p = polyfit(x,y,i);
    xfit=x(1):0.1:x(end); 
    yfit= polyval(p,xfit);
    plot(x,y,'ro',xfit,yfit);  
    set(gca,'Fontsize',14);
    ylim([-17, 11]); 
    legend(4,'Data points','Fitted curve');
end