Angle between a vector and the positive X axis
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Hi all,
I wish to find the angle between a vector that has the equation y=m*x+c and the positive X axis. Is there a way in MATLAB that I can do it. I get the values for m and c using polyfit. The slope m doesnt always give the angle with reference to the positive X axis. I was wondering if there is an easier way in MATLAB to do this.
Your help is appreciated.
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Answers (4)
Steve Eddins
on 4 Jun 2012
Try this:
atan(m)
If you need the answer in degrees, then:
atan(m) * 180 / pi
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oblivious
on 4 Jun 2012
you might want to consider all possible combinations i.e. 1st and 2nd quadrant.
b=atan(m);
if b<0
ang=pi+b;
else ang=b;
end
Walter Roberson
on 8 Jul 2012
Is this actually the same question as http://www.mathworks.co.uk/matlabcentral/answers/40497-error-with-atan ?
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Ryan seader
on 14 Aug 2020
You decide to find a resultant of more than just two forces by resolving each individual force into its rectangular components and then combining them to find the rectangular components of the resultant force. You do not want to use the triangle rule with the law of sines and cosines, because you would need to do it first for the first two vectors and then again to combine the third vector with the resultant of the first two. The following steps can be arranged to allow for the determination of the magnitude and direction of the resultant force of multiple forces using their rectangular components. Give the correct order in which to implement each step, assuming that you are going to calculate the magnitude of the resultant first before you calculate its direction.
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