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Extract or Assign Trackframe Track ID

Source: R/accessor.R
tf_id.Rd

This function retrieves the track ID values from a trackframe object. The trackframe has a data frame-like structure with an attribute specifying the column containing track ID values.

Usage

id(tf)

id(tf) <- value

Arguments

tf

A trackframe object containing the tracking data. Must have an attribute indicating the track ID column (id).

value

new values for id column

Value

A vector of track ID values extracted from the trackframe. NULL if no id column is configured.

Examples

id(tf_mini)
#>  [1] "track_1" "track_1" "track_1" "track_1" "track_1" "track_2" "track_2"
#>  [8] "track_2" "track_2" "track_3" "track_3"
id(tf_mini) <- rep("new_trackname", nrow(tf_mini))