[R-sig-eco] Fw: Directional data in time series

[Holland, Jeffrey D]

/*-----------------------------------------------------------------------------------------------------------------------------
Jeffrey D. Holland, Professor                                             jdhollan using purdue.edu
Dept. of Entomology, Purdue University                        765 / 494-7739
Section Editor, Current Landscape Ecology Reports     Skype: ecobugprof
Associate Editor, Landscape Ecology                        www.entm.purdue.edu/landscapeecology
Fellow of the Indiana Academy of Science                     http://www.bugsmapsandmath.com
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________________________________________
From: Holland, Jeffrey D
Sent: Tuesday, September 4, 2018 7:36 AM
To: g.cerritelli
Subject: Re: [R-sig-eco] Directional data in time series

Dear Giulia,
     I would suggest reading the book on Circular Statistics by Fisher---it is excellent.  Perhaps if you plotted the cosine of the direction on the x-axis?
Cheers,
Jeff

/*-----------------------------------------------------------------------------------------------------------------------------
Jeffrey D. Holland, Professor                                             jdhollan using purdue.edu
Dept. of Entomology, Purdue University                        765 / 494-7739
Section Editor, Current Landscape Ecology Reports     Skype: ecobugprof
Associate Editor, Landscape Ecology                        www.entm.purdue.edu/landscapeecology
Fellow of the Indiana Academy of Science                     http://www.bugsmapsandmath.com
-------------------------------------------------------------------------------------------------------------------------------*/

________________________________________
From: R-sig-ecology <r-sig-ecology-bounces using r-project.org> on behalf of g.cerritelli <giulia.cerritelli using biologia.unipi.it>
Sent: Tuesday, September 4, 2018 6:38 AM
To: r-sig-ecology using r-project.org
Subject: [R-sig-eco] Directional data in time series

Dear R list,

I have data on the heading kept by an animal during a migratory
movement. I would like to represet this data not using a circular plot
but on a xy-plot, to represent the change of kept directions over time.
I have tried already to do this, but because the animal keeps always a
direction between 30° and 250°, the final plot is not easily readable
(the northern directions represented by 0° and 360° are represented at
the opposite sides of the axis). Do you have any ideas on how to set the
order of a continuos variable (from 0 to 360)in a different way for the
axis of a plot? For example I would like to have an y-axis starting at
180° and ending at 179°, with 360° next to 0° (so to have values
indicating the North all in the same area of the axis). Thank you in
advance for any suggestion

Kind regars,
Giulia

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