angle-betw​een-a-vect​or-and-the​-positive-​x-axis

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Maria Tipikina
Maria Tipikina 2015-7-9
评论： Bjorn Gustavsson 2015-7-9
How can i find an angel between x axis and vector
[fi,ro]=cart2pol(X-X(1),Y-Y(1)-20); [fim1,id]=max(fi); Rom1=ro(id); [xm1,ym1]=pol2cart(fim1,rom1); Xm1=X(1)+[0,xm1]; Ym1=Y(1)+20+[0,ym1];

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回答（1 个）

Bjorn Gustavsson
Bjorn Gustavsson 2015-7-9
Have a look at the help for atan2.
HTH
  2 个评论
Bjorn Gustavsson
Bjorn Gustavsson 2015-7-9
You simply call atan2:
phi = atan2(Ycomponent,Xcomponent);
And there you have your angle between the vector and the x-axis, in radians.
Or more explicitly to calculate the angles for 8 vectors, try this exqample:
plot([1 1 0 -1 -1 -1 0 1]',[0 1 1 1 0 -1 -1 -1]','s-'),axis([-1 1 -1 1]*1.1)
arrow(0*[[0 1 1 1 0 -1 -1 -1]',[1 1 0 -1 -1 -1 0 1]'],[[0 1 1 1 0 -1 -1 -1]',[1 1 0 -1 -1 -1 0 1]'])
atan2([0 1 1 1 0 -1 -1 -1]',[1 1 0 -1 -1 -1 0 1]')*180/pi
(The arrow function you'll have to download from the file exchange.)
HTH

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