Question with error message

[Sarah Comer]

Hi Chris

Sorry to trouble you with a very novice question, but I keep getting the error below when I try to run variograms in R-studio. I can't see anything similar in the user group thread, and can't see anything obvious the data I'm importing.  Data was exported from Movebank, and I ran filters to check for duplicates. Time stamps look fine also.

Error in rep(0, nrow(data)) : invalid 'times' argument

Could you please give me an idea where or what I should be looking for to fix?

Thanks !!

Sarah

[Christen Fleming]

Hi Sarah,

I've never seen that error. Please send me a minimal working example (data + script) and I will look into it.

Best,

Chris

[Jesse Alston]

Hi Sarah,

This sounds like the error I get when the date does not import as POSIXct. Check str() to make sure the dates didn't import as character or numeric.

Jesse

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Jesse Alston

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[Sarah Comer]

Hi Jesse

Thanks for this! I tried to run again after changing the timestamp string to POSIXct, but had the same error come up.

Have emailed the script and a subset of my data file.
Thanks for your help :-)

Sarah

[Matt Keeling]

Hi Sarah,

I'm running into the same issue. Were you able to figure out what was causing the error?

[Christen Fleming]

Hi Matt,

IIRC, Sarah's issue was just a simple scripting error (bad variable name). Feel free to send me a minimal working example (data + script) and I can take a look at your issue.

Best,

Chris

[Sarah Comer]

Hi Matt, Chris

Yes it was a scripting error my end , with the elements in my list of animals starting with a number.  

Chris suggested I wrapped these, and when I did this all worked well. 

Cheers

Sarah

[Matt Keeling]

Thanks Sarah and Chris for the info. I will pass this along to others that I know that will also be attempting this. 

Chris, I sent you my script and data.

[Christen Fleming]

Hi Matt,

There are multiple individuals in the CSV, and variogram() was being called on the list of individuals rather than on a single individual. I will add an informative error message for that.

CSV <- read.csv("E://OneDrive - Smithsonian Institution/DATA/Matt Keeling/SampleData.csv")
# the timestamps aren't in POSIX format

# timeformat="auto" will *try* to guess the format

DATA <- as.telemetry(CSV,timeformat="auto")
# this is a list of 50 individual telemetry objects
class(DATA)
length(DATA)
class(DATA[[1]])
# so this won't work
SVF <- variogram(DATA)
# this works
SVF <- variogram(DATA[[1]])
zoom(SVF)
# this also works
SVFS <- lapply(DATA,variogram)
zoom(SVFS[[1]])

Best,

Chris