[R-sig-eco] redisltraj with u=1 (adehabitatLT)

2013-03-16 Thread Sebastian P. Luque
--->--- Notice that the new 'nb.reloc' is lacking the last relocation of the input ltraj. The argument 'addbit' is irrelevant, since type="time". Am I missing something? Cheers, -- Sebastian P. Luque, Ph.D. Postdoctoral Research Fellow Room 367, Duff Roblin Bui

[R-sig-eco] order of id's in ltraj object

2013-03-08 Thread Sebastian P. Luque
Hi, I noticed that as.ltraj() reorders the id's alphanumerically. However, I'd like to keep the order in the input data.frame or SpatialPointsDataFrame for plotting purposes. Is there some way to achieve that, except for manipulating the structure of the ltraj object? Thanks, -- Seb

[R-sig-eco] kernelUD non-square grid cells

2012-03-30 Thread Sebastian P. Luque
Hi, In ?kernelUD, the "grid" argument is described as: ------ grid: a number giving the size of the grid on which the UD should be estimated. Alternatively, this parameter may be an object inheriting the

Re: [R-sig-eco] from estUD to SpatialGridDataFrame in adehabitatMA

2012-03-23 Thread Sebastian P. Luque
On Fri, 23 Mar 2012 17:33:46 +0100, Clement Calenge wrote: [...] > I have the same problem. But I am not sure that the class estUD is the > cause here. Indeed, transforming the object to the class > SpatialPixelsDataFrame does not change the problem: >> locs.gtiff <- create2GDAL(as(ud[[1]], "Sp

Re: [R-sig-eco] from estUD to SpatialGridDataFrame in adehabitatMA

2012-03-23 Thread Sebastian P. Luque
On Fri, 23 Mar 2012 16:37:42 +0100, Clement Calenge wrote: > Hi, Please consider this example: >> ## Load the data data(puechabonsp) loc <- puechabonsp$relocs ## >> Estimation of UD for the four animals (ud <- kernelUD(loc[,1])) > ** Utilization distribution of several Animals *

[R-sig-eco] from estUD to SpatialGridDataFrame in adehabitatMA

2012-03-23 Thread Sebastian P. Luque
Hi, Before adehabitat was split, I used the function asc2spixdf() to convert the estimated UD to SpatialGridDataFrame. I see that there's a estUDm2spixdf() to convert it to SpatialPixelsDataFrame. Should the coercion to SpatialGridDataFrame be done separately in sp? Cheers, -- Sebast

[R-sig-eco] population-level kernel utilization distribution

2010-11-27 Thread Sebastian P. Luque
Hi, The problem of estimating a utilization distribution for a group of animals, based on movement trajectories from each individual is a complex one. Differences in the duration and frequency of locations of individual tracks from multiple animals should be accounted for when calculating such a

Re: [R-sig-eco] Power analysis on mixed model

2008-12-17 Thread Sebastian P. Luque
On Thu, 18 Dec 2008 10:23:33 +1100, "Caitlin Vertigan" wrote: > Hi all, I've just completed an analysis of short-tailed shearwater > breeding success in relation to human disturbance using a mixed model. > I'd like to do a power analysis on this now but am unaware of any way > to do it. Is it po

Re: [R-sig-eco] classical statistics in R

2008-11-10 Thread Sebastian P. Luque
In general, I would not choose a book to learn basic statistics based on whether it has R content or not. What's important is to learn the concepts. Learning how to use them in a particular software is useful, but secondary. If we're careless about this distinction, we risk falling into habits p