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Answer 1

+4 A:

The standard C math.h functions are available:

#include <math.h>

...
float theta = atan2f(y, x);
...

Louis Gerbarg 2009-07-20 10:20:03

Note that in most atan2 functions, Y is the first parameter, not X

Sean 2009-07-20 21:13:38

You are correct, fixed.

Louis Gerbarg 2009-07-21 01:13:29

Answer 2

+3 A:

atan2(y, x) is the same thing as atan(y/x), but it can deal properly with the case where x = 0 (i.e. a vertical line going up or down) without having do deal with positive vs. negative infinity.

David Maymudes 2009-07-20 13:29:26

Note that in most atan2 functions, Y is the first parameter, not X

Sean 2009-07-20 21:14:09

thanks, fixed it!

David Maymudes 2009-07-21 03:09:11

Answer 3

+8 A:

Jason S 2009-07-20 21:01:02

Yes. Basically atan2 gets you into the correct quadrant.

Nosredna 2009-07-20 21:03:52

Note that in most atan2 functions, Y is the first parameter, not X

Sean 2009-07-20 21:14:40

Yay, edited. Now you get upvoted. :)

Sean 2009-07-20 21:20:19

i got lazy and followed the other 2 answ w/o looking it up. thanks for the prod. :-)

Jason S 2009-07-20 21:28:56

Answer 4

A:

Thx for answer.. it was helpful .. SOLVED

Miky 2010-04-01 07:15:21

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