尝试一下线性拟合

clear

clc

close all

x=[0 1 2 3 4 5 6 7];

y=[0 3 5 7 9 11 15 19];

coeffit=polyfit(x,y,1);

slope=coeffit(1);

intercept=coeffit(2);

figure(1)

scatter(x,y,'filled')

hold on

x_fit = min(x):0.1:max(x);

% y_fit = slope * x_fit + intercept;

y_fit=polyval(coeffit,x_fit)

plot(x_fit, y_fit, 'r');

hold off

grid on