TWGeos preprocessLight error

[abuckardt]

Hello,

I'm just starting out with analyzing my geolocator data for my Master's thesis. I'm running into some issues when I try to use the preprocessLight function in the TWGeos package and keep running into an error. I'm not exactly sure what the error message means or how I might go about fixing it. I think it has to do with the format of my data, but don't know where to start. Any help would be appreciated. Thanks!

Anna 

 

My dataset:

 

> head(d.lig)

                 Date Light

2 2016-05-26 03:00:21    44

3 2016-05-26 03:02:21    24

4 2016-05-26 03:04:21    24

5 2016-05-26 03:06:21    24

6 2016-05-26 03:08:21    24

7 2016-05-26 03:10:21    24

> str(d.lig)

'data.frame': 300000 obs. of  2 variables:

 $ Date : POSIXct, format: "2016-05-26 03:00:21" "2016-05-26 03:02:21" "2016-05-26 03:04:21" ...

 $ Light: int  44 24 24 24 24 24 24 12 8 10 ...

 

 

The code I run:

 

threshold

 

twl

                       threshold = threshold,

                       offset = 18, 

                       lmax = 12, 

                       zlim = c(0, 12), 

                       dark.min = 240,

                       gr.Device = "default")

 

 

The error message:

 

Error in seq.default(as.numeric(tmin) + dt/2, as.numeric(tmax) - dt/2,  : 

  'from' must be of length 1

 

 

[Evelien]

Hello,

I encountered the same error in one of my geolocator files. What worked for me was to subset the raw data to make sure the dates don't span more than 1 year. My original data file spanned from 6/15/16 to  8/5/17, and I think having >1 year of raw data is what causes that error to pop up. I subsetted my raw data so it only went from 6/15/16 to 6/14/17 and then the preprocessLight function worked.

In my case I only needed the 1 year, so I didn't lose data that I wanted. I suppose if you wanted to cover the whole span that you have and it's more than 1 year, you might have to do it in two chunks (separate your raw data into two dataframes).

I realize this reply is a year after your original post, but I hope this helps in case this has still been a problem. Or at least it can help other folks looking this error up as I did at first just recently.

Best,

Evelien