[SciPy-User] difference of angles - to be between -180 and + 180

Chris Colbert sccolbert@gmail....
Thu Nov 19 07:34:25 CST 2009


On Thu, Nov 19, 2009 at 1:48 PM, Sebastian Haase <seb.haase@gmail.com> wrote:
> On Wed, Nov 18, 2009 at 5:19 PM, Jonathan Guyer <guyer@nist.gov> wrote:
>> On Nov 18, 2009, at 11:14 AM, I wrote:
>>
>>>   return np.fmod(d + 540, 360) - 180
>>
>> Actually, I think you can just write (d + 540) % 360 - 180
>>
>> I think we used fmod because of some automatic weave inlining we do
>> that didn't play nice with '%'.
>
> Hi Jonathan,
> thanks for your answer. I might prefer your solution simply for its brevity.
>
> However, there are also some sign "problems":
> for the angle from -10 to 180 I was expecting +170, but your solution
> returns -170.
>
> and for (to:)'190' (from) '-10'  expected: '160' , yours returns -160.
>


-170 and -160 are the correct answers for those differences


> I have a list of 30 test cases, which these are the only 2 were yours
> gave unexpected results regarding the sign -- besides the fact that
> yours always returns -180 instead of +180, but that is obviously not
> really wrong.
>
> Thanks,
> Sebastian
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