Date: Jan 7, 2013 10:24 AM
Author: dpb
Subject: Re: atan2, angle

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 four-quadrant
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...