Calculates the inverse trigonometric tangent function (arctangent) of y/x, returning the angle in the correct quadrant. Angle units are in radians. The function is defined for real values only.
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Syntax |
Description |
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out = atan2(y,x); |
x,y must be real. The range of atan2 is - π to π . |
Example
Plot atan2(y,x) for - π ≤ theta≤ π .
theta=linspace(-pi,pi,1000); x=cos(theta); y=sin(theta); plot(theta*180/pi,atan2(y,x)*180/pi,"theta (deg)","atan2(y,x) (deg)","atan2(y,x)"); plot(y/x,atan2(y,x)*180/pi,"y/x","atan2(y,x) (deg)","atan2(y,x)");
Calculate atan2 at (1,1) and (1,-1). The angle is converted to degrees.
?atan2(1,1)*180/pi; result: 45 ?atan2(1,-1)*180/pi; result: 135
See Also
List of commands , atan , tan