how to calculate degree between 3 points in MATLAB?
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hi, how can i caculate degree between 3 points? i have position of X and Y of this three points. for more information please see this picture ( http://theme.tk/wp-content/uploads/2013/01/Untitled1.png ) and download this file ( http://theme.tk/wp-content/uploads/2013/01/data.zip ).
2 Comments
Azzi Abdelmalek
on 1 Jan 2013
In your image there are 4 points? Can you be more clear by giving an example of coordinates
Answers (2)
Roger Stafford
on 1 Jan 2013
Let row vectors P0 = [x0,y0], P1 = [x1,y1], and P2 = [x2,y2] be Calcaneus, L-Knee, and 2th_MT points, respectively. The angle shown in red in radians at Calcaneus point is:
ang = atan2(abs(det([P2-P0;P1-P0])),dot(P2-P0,P1-P0));
Multiply by 180/pi to get degrees.
Roger Stafford
10 Comments
Roger Stafford
on 1 Jan 2013
No mohammad, I think you had better do that. That last vectorized formula I presented will have to suffice for my contribution to your effort.
Image Analyst
on 1 Jan 2013
Check out this link:
2 Comments
Image Analyst
on 1 Jan 2013
Try this one then: http://www.mathworks.com/matlabcentral/newsreader/view_thread/276582 or do your own search.
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