I'm sorry for cross postings, as I'm not sure where exactly to ask this question:



I am trying to estimate a Brownian Bridge kernel home range using adehabitatHR. I created



I created a traj file as below:

bobtraj<-as.ltraj(xy=bob_locs_ss[c("x","y")], id=bob_locs_ss$id, date=bob_locs_ss$newdate, burst=bob_locs_ss$burst2)



Then tried to create a kernelBB as follows, with a reference grid around the animal's home range:

bob_bbss<- kernelbb(bobtraj, sig1=4.0811, sig2=50, grid = refgrid, byburst = TRUE, extent = 0.2)



I then got this error:

Error in as.vector(gr) : no method for coercing this S4 class to a vector



I didn't get the error and the function worked when I ran kernelBB() without byburst=TRUE. However, I would like to keep this specification in the model, as my data were collected at high-frequency with two days on and two days off, and without the burst=TRUE, the kernelBB95 looks quite oversmoothed.



Can anyone provide any advice on how to fix this error?



Thanks for your help,

Leila Brook



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