[R] CRAN - Package "activity" - how do you convert time (hh:mm) into radians in R 3.1.2 on Windows 7 OS 64bit

[Jeff Newmiller]

Think astronomy. 

https://en.m.wikipedia.org/wiki/Hour_angle
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Sent from my phone. Please excuse my brevity.

On November 4, 2015 12:02:46 AM PST, Martin Maechler <maechler at stat.math.ethz.ch> wrote:
>>>>>> Bert Gunter <bgunter.4567 at gmail.com>
>>>>>>     on Tue, 3 Nov 2015 14:54:46 -0800 writes:
>
>    > ... should have said: with a 24 hour "clock".
>    > -- Bert
>    > Bert Gunter
>
>Hmm,  thank you Bert.
>
>I know nothing about measuring time in radians, and for me,
>'radians' are angles, and hence we are talking about
>analogue watches when measuring time with them, and now, as a
>citizen from  "the watch maker country" I do like analogue
>watches or let's nowadays say "graphical" watches, i.e., with clock
>faces and short and long (hour and minute) hands, and I think I
>have only ever seen 12 h watches at least on church towers (yes,
>here in CH) or wrist watches...
>(?)
>
>Martin
>(Maechler, ETH Zurich, Switzerland)
>
>> On Tue, Nov 3, 2015 at 2:52 PM, Bert Gunter <bgunter.4567 at gmail.com>
>wrote:
>    >> Hint: 24 hours = 24x60 = 1440 minutes = 2 pi radians.
>    >> 
>    >> Cheers,
>    >> Bert
>    >> Bert Gunter
>    >> 
>>> "Data is not information. Information is not knowledge. And
>knowledge
>    >> is certainly not wisdom."
>    >> -- Clifford Stoll
>    >> 
>    >> 
>>> On Tue, Nov 3, 2015 at 2:00 PM, Typhenn Brichieri-Colombi via R-help
>    >> <r-help at r-project.org> wrote:
>    >>> Hello,
>>>> I am using the "activity" package developed by Marcus Rowcliffe
>(released in February, 2015). This package uses time in radians to
>estimate activity. I have camera trap data in 24 hour times (hh:mm) -
>how do I convert these into radians? (e.g. My time-of-detection at
>19:44, how do I convert this into radians?)
>    >>> Thank you for your time and your help
>    >>> [[alternative HTML version deleted]]
>    >>> 
>    >>> ______________________________________________
>  >>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>    >>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
> >>> and provide commented, minimal, self-contained, reproducible code.
>
>    > ______________________________________________
>    > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>    > https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>   > and provide commented, minimal, self-contained, reproducible code.
>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.