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Topic: atan2, angle
Replies: 2   Last Post: Jan 7, 2013 10:45 AM

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dpb

Posts: 8,182
Registered: 6/7/07
Re: atan2, angle
Posted: Jan 7, 2013 10:24 AM
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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...

--



Date Subject Author
1/7/13
Read Re: atan2, angle
dpb
1/7/13
Read Re: atan2, angle
Bruce Bowler

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