Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


dpb
Posts:
9,333
Registered:
6/7/07


Re: atan2, angle
Posted:
Jan 7, 2013 10:24 AM


On 1/7/2013 5:15 AM, erik poljanec wrote: ...
> ... but when i need to use atan2 the rezult of > equation is 0° insted of 202°. i had tray atan2, angle.... now i dont > know what i am doing wrong. pleas help. > the equation in the paper: > > alpha=atan2((sin(lambda)*cos(epsilon)tan(beta)*sin(epsilon))/cos(lambda)) ...
The function ATAN2() is defined as the arctangent of the fourquadrant y,x coordinates as atan2(y,x)
Your equation above has only a single argument so either
a) the atan2() in the paper isn't the same definition as the commonly implemented intrinsic/Matlab function, or
b) you have transcribed the equation incorrectly.
doc atan2 % to see what Matlab expects, anyway...




