On May 17, 2013, at 7:44 AM, Rémi Lesmerises wrote:
> Dear all,
>
> I'm trying to get a Brownian bridge kernel (kernelbb) for each combination of
> two consecutive animal locations (see commands below) and put them, with a
> loop, inside a list. It works well at the beginning but after 42 runs, it
> appears the following warning :
>
>
>> Error in seq.default(yli[1], yli[2], by = diff(xg[1:2])) :
>> invalid (to - from)/by in seq(.)
>
> I looked at the coordinates, at the id, at the time of the run 43 and it's
> all good...
>
> I looked on the net and it happened to only one person and there was no
> answer to his post.
I wonder if that posting (like yours) had no data on which to display the
problem or to test potential solutions? I would think you would want to post
any setup objects and then data for items 40-45.
>
> Someone could help me?
>
> ## commands
>
> BBtraj <- list()
> for (i in 1:(nrow(loc@data)-1)) {
> BBtraj[[i]] <- kernelbb(as.ltraj(loc@coords[i:(i+1),],
> date=loc@data$time[i:(i+1)], id = as.character(loc@data$id[i:(i+1)]),
> typeII = TRUE), sig1=as.numeric(as.character(loc@data$sig1[i])), sig2= 5,
> grid = 1000)
> }
>
--
David Winsemius
Alameda, CA, USA
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