Best Fit Line Drawing

Dear All;

I have many points and i need to draw the best fit line between these points , how can i do it ?

Best Regards

Answer 1

[Daniel Shub]

For a straight line you can use lsline

plot(randn(10, 1), '*')
lsline

[Sean de Wolski]

That's awesome, learn something new every day!

Answer 2

[Azzi Abdelmalek]

Use interp1 function. You can also use a curve fitting toolbox

% Example

x=0:0.5:2
y=x.^2+2*x+rand(1,numel(x))
plot(x,y,'or')
xi=0:0.1:2;
yi=interp1(x,y,xi,'spline')
hold on
plot(xi,yi,'g')
hold off

Answer 3

[José-Luis]

Without a toolbox:

    x = 1:10; 
    y = x + randn(1,10); 
    plot(x,y,'b*') 
    P = polyfit(x,y,1);
    yfit = P(1)*x+P(2);
    hold on;
    plot(x,yfit,'r-.');