fx.total error

[cbpozz...@alaska.edu]

Hello all, I have what I hope will be an easy question. I am trying to produce a surface of coyote activity centers using fx.total() and I am getting an error that I can't figure out. here is the simple line of code that I have tried to run and the error it produces:

> fxsurface <- fx.total(foxs_null, sessnum=2)

 

Error in fx.total(foxs_null, sessnum = 2) : not for ms model

At first I thought that the "ms" might mean multisession, but you can see that I added in the sessnum argument and still got the error. Anyone know what this error is trying to tell me? Thanks!

Casey

[Murray Efford]

Hi Casey
'ms' really does refer to multisession models (there's even a function ms that tests for whether a model fit or capthist object is multisession). What you stumbled on was an inconsistency in the code: it seemed to let you specify a sessnum for multisession data, then spat it out if you tried. Whoever wrote this **** didn't finish the job. I have rushed through a change that should make it work as expected (see working version 2.9.6 at www.otago.ac.nz/density/SECRinR.html). At least I can do

library(secr)
fxsurface <- fx.total(ovenbird.model.D, sessnum=3)
plot(fxsurface, covariate = 'D.sum')

and get a meaningful plot, or at least as meaningful as one ever gets from fx.total. Note the need to specify covariate = 'D.sum' (the default D.0 fails).
Thanks for reporting this, and let me know if there are further problems.
Murray

[cbpozz...@alaska.edu]

Thanks for the response, Murray. The fix has allowed me to run fx.total() with a null model (holding D constant) and get a nice plot. However, now when I try and use this function with the D~session model or a model with a user defined habitat covariate, I get an error....

> rffxsurface <- fx.total(model=foxs_Dsession, sessnum=2, mask=sfoxs14)

Error in 1:nrow(sessmask) : argument of length 0

Do you have any suggestions on this error message? I am not totally clear on what it is trying to tell me, so my error mitigation attempts up to now have been unsuccessful. Thanks again

Casey

[Murray Efford]

Probably you mean this --
rffxsurface <- fx.total(object=foxs_Dsession, sessnum=2, mask=sfoxs14)

I think it also expects 'mask' to be the mask for a single session, not a list of masks; I can't tell whether sfoxs14 meets this requirement.

Murray

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[cbpozz...@alaska.edu]

HI Murray,

Sorry for the copy mistake with the code. In my actual model I did indeed run 
 

rffxsurface <- fx.total(object=foxs_Dsession, sessnum=2, mask=sfoxs14).

I have different masks for each of my 4 sessions, and "sfoxs14" in this case does represent the mask for my second session. So even when I specify the appropriate session mask, I am still getting the "Error in 1:nrow(sessmask):argument of length 0" error