[EMAIL PROTECTED] wrote:
hi
atan2 is supposed to return the angle to x-axis when given y and x, I
suppose if I take [x,y] to one full circle, I should get 0-360 degree
back---- but no, I get 3 full revolutions!
maybe my understanding is wrong.
from math import *
def f(ang):
a=ang
if a>360: a-=360
if a>360: a-=360
if a<0: a+=360
if a<0: a+=360
return round(a)
for i in range(0,360):
t=2*pi*i/360.0
print i,f(atan2(sin(t),cos(t))*180.0)
Your understanding of atan2 is correct, but your conversion from radians
to degrees is off by a factor of pi. Since pi is close to 3, you're
getting what appears to be three full revolutions.
HTH,
--
Carsten Haese
http://informixdb.sourceforge.net
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