The active group is the combination of group names to group the data sets. The active_group acts essentially like a paste(names_of_groups, sep = '_') grouping variable.
active_group(x)a c_grouping
#'
data("raccoon")
raccoon$timestamp <- as.POSIXct(raccoon$timestamp, "EST")
burstz <- list(id = raccoon$animal_id, month = as.POSIXlt(raccoon$timestamp)$mon)
mb1 <- make_c_grouping(x = burstz, active_group = c("id", "month"))
# see the current active burst
active_group(mb1)
#> [1] "id" "month"
# change the active burst
active_group(mb1) <- "id"
# Using a full data set
my_track <- as_sftrack(raccoon,
time = "timestamp",
error = NA, coords = c("longitude", "latitude"),
group = burstz
)
summary(my_track)
#> animal_id latitude longitude
#> Length:445 Min. :26.07 Min. :-80.28
#> Class :character 1st Qu.:26.07 1st Qu.:-80.28
#> Mode :character Median :26.07 Median :-80.28
#> Mean :26.07 Mean :-80.28
#> 3rd Qu.:26.07 3rd Qu.:-80.28
#> Max. :26.08 Max. :-80.27
#> NA's :168 NA's :168
#> timestamp height hdop
#> Min. :2019-01-19 00:02:30.00 Min. : -30.00 Min. :0.000
#> 1st Qu.:2019-01-22 07:02:30.00 1st Qu.: 1.00 1st Qu.:0.000
#> Median :2019-01-25 23:02:30.00 Median : 7.00 Median :1.300
#> Mean :2019-01-25 22:22:18.39 Mean : 36.65 Mean :1.691
#> 3rd Qu.:2019-01-29 07:02:09.00 3rd Qu.: 15.50 3rd Qu.:2.500
#> Max. :2019-02-01 23:02:30.00 Max. :1107.00 Max. :9.900
#> NA's :198
#> vdop fix sft_group geometry
#> Min. :0.000 2D: 37 TTP-041_0 :208 POINT :445
#> 1st Qu.:0.000 3D:240 TTP-041_1 : 15 epsg:NA: 0
#> Median :1.900 NO:168 TTP-058_0 :207
#> Mean :1.938 TTP-058_1 : 15
#> 3rd Qu.:3.200 active_group: id, month: 0
#> Max. :8.400
#>
# change active group
active_group(my_track$sft_group) <- "id"
summary(my_track)
#> animal_id latitude longitude
#> Length:445 Min. :26.07 Min. :-80.28
#> Class :character 1st Qu.:26.07 1st Qu.:-80.28
#> Mode :character Median :26.07 Median :-80.28
#> Mean :26.07 Mean :-80.28
#> 3rd Qu.:26.07 3rd Qu.:-80.28
#> Max. :26.08 Max. :-80.27
#> NA's :168 NA's :168
#> timestamp height hdop
#> Min. :2019-01-19 00:02:30.00 Min. : -30.00 Min. :0.000
#> 1st Qu.:2019-01-22 07:02:30.00 1st Qu.: 1.00 1st Qu.:0.000
#> Median :2019-01-25 23:02:30.00 Median : 7.00 Median :1.300
#> Mean :2019-01-25 22:22:18.39 Mean : 36.65 Mean :1.691
#> 3rd Qu.:2019-01-29 07:02:09.00 3rd Qu.: 15.50 3rd Qu.:2.500
#> Max. :2019-02-01 23:02:30.00 Max. :1107.00 Max. :9.900
#> NA's :198
#> vdop fix sft_group geometry
#> Min. :0.000 2D: 37 TTP-041 :223 POINT :445
#> 1st Qu.:0.000 3D:240 TTP-058 :222 epsg:NA: 0
#> Median :1.900 NO:168 active_group: id: 0
#> Mean :1.938
#> 3rd Qu.:3.200
#> Max. :8.400
#>