Hi. I am running the as.ltraj () function in adehabitat (v 1.4 under R 2.2.1)
but can't seem to correctly specify the burst argument. i.e., the ltraj
object returned consists of only one component, when in fact my data consist
of more than one burst of reloctions per animal. i've set up the data (xy,
date, id, burst) in list form following the example given in ?as.ltraj. to
simplify, following is a section of the data for the 65th animal in my list
dataset:
x y loctime burst
479347 5515636 2005-07-07 21:05:20 bird498
479405 5515729 2005-07-07 21:12:00 bird498
479397 5515740 2005-07-07 21:12:20 bird498
479388 5515740 2005-07-07 21:13:15 bird498
479398 5515724 2005-07-07 21:16:20 bird498
479416 5515717 2005-07-07 21:20:00 bird498
479387 5515670 2005-07-07 21:34:00 bird498
479225 5515689 2005-07-08 10:04:25 bird499
479251 5515692 2005-07-08 10:06:33 bird499
479290 5515705 2005-07-08 10:08:31 bird499
479327 5515701 2005-07-08 10:09:29 bird499
479390 5515744 2005-07-08 10:20:03 bird499
479363 5515734 2005-07-09 09:18:24 bird500
479373 5515746 2005-07-09 09:20:00 bird500
479372 5515745 2005-07-09 09:20:30 bird500
479373 5515746 2005-07-09 09:20:50 bird500
479391 5515715 2005-07-09 09:22:40 bird500
479356 5515761 2005-07-09 09:28:11 bird500
479270 5515806 2005-07-11 13:50:10 bird501
479295 5515780 2005-07-11 13:55:15 bird501
479311 5515770 2005-07-11 13:57:30 bird501
479391 5515791 2005-07-11 14:05:10 bird501
479403 5515784 2005-07-11 14:08:25 bird501
and the code i input for this animal is:
(mytr1 <- as.ltraj(myxy[[65]][1:2], date = myxy[[65]][3],
id="animal65",
burst=myxy[[65]][4]))
i'm returned a list of class traj with only one component which identifies
the animal, concatenates all unique burst character strings, and gives the
total number of relocations.
the burst data in my dataset are of the form is.character. Does anyone know
what I'm doing incorrectly to be returned a list of only one component per
animal (where number of relocations is total number of relocations per
animal)? instead of the desired list with x components per animal (x number
bursts) with associated number of relocations per burst?
Thanks in advance.
Tina Leonard
M.Sc. candidate
Department of Biology
Acadia University
Wolfville, NS
CANADA
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