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...

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