[R] Zoo for plotting time and dates

[Gabor Grothendieck]

This was already answered here:

https://stat.ethz.ch/pipermail/r-help/2009-January/184839.html

On Wed, Jan 14, 2009 at 8:26 AM, Neotropical bat risk assessments
<neotropical.bats at gmail.com> wrote:
> Hi all,
>
> For some reason the messages keep getting rejected.
> trying again...
>
>
> As I understand the zoo package will aggregate dates and times, but unclear
> how to tackle this problem.
>
> I need to accomplish the following:
>
> 1. Generate a scatter plot of bat activity with dates on the X-axis and time
> on the Y-axis.
> include sunset and sunrise curves as an added part of graphic.
>
> In Excel I have a kludged way to do this, but it is not exactly what I need
> and the times on the Y axis do not display correctly due to the 24:00 roll
> over to next date and would prefer to understand how to do this using R so I
> can repeat it with multiple data sets for multiple locations.
> I removed the Graphic display as apparently the server refused the massage
> with it.
> I can email directly if anyone is able to assist or wished to see it.
>
> A sample of the data format is below.
> Any suggestion welcome.
>
> Tnx.
>
> The bat activity data is in the format below with the species name, date and
> time the species was active.
>
> Spec_code       Date    Time
> Eptfus          6/4/03  22:44
> Eptfus          6/4/03  22:44
> Eptfus          6/9/03  21:59
> Eptfus          6/10/03 3:24
> Eptfus          6/13/03 0:22
> Eptfus          6/13/03 3:24
> Eptfus          6/17/03 0:03
> Eptfus          6/17/03 2:43
> Eptfus          6/17/03 21:59
>
>
>
> The sunset-Sunrise data seen below is also straight forward:
>  Date   Rise    Set
> 6/1/2003        4:12    19:50
> 6/2/2003        4:11    19:51
> 6/3/2003        4:10    19:52
> 6/4/2003        4:10    19:53
> 6/5/2003        4:09    19:54
> 6/6/2003        4:09    19:54
> 6/7/2003        4:09    19:55
> 6/8/2003        4:08    19:56
> 6/9/2003        4:08    19:57
> 6/10/2003       4:08    19:57
> 6/11/2003       4:07    19:58
> 6/12/2003       4:07    19:58
> 6/13/2003       4:07    19:59
> 6/14/2003       4:07    19:59
> 6/15/2003       4:07    20:00
> 6/16/2003       4:07    20:00
> 6/17/2003       4:07    20:01
> 6/18/2003       4:07    20:01
>
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