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Draw a line throw a set of point

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valerio auricchio
valerio auricchio 2020-11-3
回答： Image Analyst 2020-11-3
Hi i have a set of poin in an immage and i want to draw a line that is madiated by the positition of the points. I want something like this:
  1 个评论
Sean Doherty
Sean Doherty 2020-11-3
you could use polyfit()
this example is from polyfit help:
% Fit a polynomial p of degree 1 to the (x,y) data:
x = 1:50;
y = -0.3*x + 2*randn(1,50);
p = polyfit(x,y,1);
% Evaluate the fitted polynomial p and plot:
f = polyval(p,x);
plot(x,y,'o',x,f,'-')
legend('data','linear fit')

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采纳的回答

Image Analyst
Image Analyst 2020-11-3
Looks like he has a solution in his duplicate question: Click here for it

更多回答（1 个）

Rik
Rik 2020-11-3
For this code to work, you will need the attached fit_line function, and my point_to_line_distance, which you can find on the FEX or through the add-on manager.
x=[0.9, 3.2, 0.2, -0.0, -10.0, -1.2, 2.5, 2.9, 15.5, 4.3, -3.5, -3.6, -1.7, 0.5, -1.5, 12.0, ...
4.6, 6.4, -0.5, -1.1, -4.7, -0.2, -1.5, -3.5, -3.6, -0.1, -2.6, -11.5, 0.3, -0.2, 0.1, ...
-3.7, -0.1, 3.9, 11.4, -11.3, 1.4, -2.1, 8.7, -7.4, 1.4, -6.1, 2.6, 0.3, 1.2, 4.9, -1.0];
y=[5.0, -1.8, 2.3, 4.8, 1.4, 3.2, 3.7, 5.3, 4.3, 5.2, 2.6, 1.8, -4.3, 3.0, -0.5, 3.2, 5.0, ...
0.3, 6.2, -4.7, -3.3, 0.8, -0.4, 1.3, -6.0, 4.1, 1.6, 1.1, 3.8, -1.6, 1.1, 2.9, -0.7, ...
0.4, 10.7, -3.0, -0.8, 4.3, 3.3, -0.8, 5.8, 2.9, 1.9, 1.4, 6.2, 5.2, 1.6];
plot(x,y,'+r')
x_bounds=xlim;
p=fit_line(x,y);
hold on,plot(x_bounds,polyval(p ,x_bounds),'r');hold off
  2 个评论
valerio auricchio
valerio auricchio 2020-11-3
What are the point_to_line? And how can i import the function?
Rik
Rik 2020-11-3
Have you clicked the link? That would probably help...

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