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Extract or set the timestamps of a Move or MoveStack object

timestamps.Rd

The timestamps method returns or sets the timestamps of a track from a Move or MoveStack object.

Usage

# S4 method for .MoveTrackSingle
timestamps(this)
  # S4 method for .MoveTrack
timestamps(this)
  # S4 method for .MoveTrack
timestamps(this) <- value

Arguments

this

move, moveStack, moveBurst, .unUsedRecords or .unUsedRecordsStack object

value

timestamps from class POSIXct

Value

vector of class POSIXct.

Note that for moveStacks a single string is returned without splitting by individual (see 'Examples').

Author

Marco Smolla & Anne Scharf

Examples

data(leroy)
data(fishers)

## get the timestamps from a Move object
head(timestamps(leroy)) 
#> [1] "2009-02-11 12:16:45 UTC" "2009-02-11 12:31:38 UTC"
#> [3] "2009-02-11 12:45:48 UTC" "2009-02-11 13:00:16 UTC"
#> [5] "2009-02-11 13:15:19 UTC" "2009-02-11 13:30:13 UTC"
## get the timestamps from a MoveStack object
head(timestamps(fishers)) 
#> [1] "2009-02-11 12:16:45 UTC" "2009-02-11 12:31:38 UTC"
#> [3] "2009-02-11 12:45:48 UTC" "2009-02-11 13:00:16 UTC"
#> [5] "2009-02-11 13:15:19 UTC" "2009-02-11 13:30:13 UTC"
## get the timestamps from a unUsedRecords object
head(timestamps(unUsedRecords(leroy)))  
#> [1] "2009-02-11 00:00:01 UTC" "2009-02-11 00:15:01 UTC"
#> [3] "2009-02-11 00:30:01 UTC" "2009-02-11 00:45:01 UTC"
#> [5] "2009-02-11 01:00:01 UTC" "2009-02-11 01:15:01 UTC"

## get timestamps separatly for each individual from a MoveStack 
str(lapply(split(fishers), timestamps))
#> List of 2
#>  $ Leroy  : POSIXct[1:919], format: "2009-02-11 12:16:45" "2009-02-11 12:31:38" ...
#>  $ Ricky.T: POSIXct[1:1000], format: "2010-02-09 17:01:23" "2010-02-09 17:28:56" ...

## change the timestamps and set it for a Move object
timestamps(leroy) <- timestamps(leroy)+60 
## change the timestamps and set it for a MoveStack object
timestamps(fishers) <- timestamps(fishers)+60.1