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)
| x | a c_grouping |
|---|
# Make a c_grouping group <- list(id = raccoons$animal_id, month = as.POSIXlt(raccoons$timestamp)$mon +1) mb1 <- make_c_grouping(x = group, active_group = c("id", "month")) # see the current active group active_group(mb1)#> [1] "id" "month"# change the active group active_group(mb1) <- "id" # Using a full data set group <- list(id = raccoons$animal_id, month = as.POSIXlt(raccoons$timestamp)$mon+1) my_track <- as_sftrack(raccoons, time = "timestamp", error = NA, coords = c("longitude", "latitude"), group = group ) summary(my_track)#> animal_id latitude longitude timestamp #> TTP-041:223 Min. :26.07 Min. :-80.28 Min. :2019-01-18 19:02:30 #> TTP-058:222 1st Qu.:26.07 1st Qu.:-80.28 1st Qu.:2019-01-22 02:02:30 #> Median :26.07 Median :-80.28 Median :2019-01-25 18:02:30 #> Mean :26.07 Mean :-80.28 Mean :2019-01-25 17:22:18 #> 3rd Qu.:26.07 3rd Qu.:-80.28 3rd Qu.:2019-01-29 02:02:09 #> Max. :26.08 Max. :-80.27 Max. :2019-02-01 18:02:30 #> NA's :168 NA's :168 #> height hdop vdop fix #> Min. : -30.00 Min. :0.000 Min. :0.000 2D: 37 #> 1st Qu.: 1.00 1st Qu.:0.000 1st Qu.:0.000 3D:240 #> Median : 7.00 Median :1.300 Median :1.900 NO:168 #> Mean : 36.65 Mean :1.691 Mean :1.938 #> 3rd Qu.: 15.50 3rd Qu.:2.500 3rd Qu.:3.200 #> Max. :1107.00 Max. :9.900 Max. :8.400 #> NA's :198 #> sft_group geometry #> TTP-041_1 :213 POINT :445 #> TTP-041_2 : 10 epsg:NA: 0 #> TTP-058_1 :212 #> TTP-058_2 : 10 #> active_group: id, month: 0 #> #>#> animal_id latitude longitude timestamp #> TTP-041:223 Min. :26.07 Min. :-80.28 Min. :2019-01-18 19:02:30 #> TTP-058:222 1st Qu.:26.07 1st Qu.:-80.28 1st Qu.:2019-01-22 02:02:30 #> Median :26.07 Median :-80.28 Median :2019-01-25 18:02:30 #> Mean :26.07 Mean :-80.28 Mean :2019-01-25 17:22:18 #> 3rd Qu.:26.07 3rd Qu.:-80.28 3rd Qu.:2019-01-29 02:02:09 #> Max. :26.08 Max. :-80.27 Max. :2019-02-01 18:02:30 #> NA's :168 NA's :168 #> height hdop vdop fix #> Min. : -30.00 Min. :0.000 Min. :0.000 2D: 37 #> 1st Qu.: 1.00 1st Qu.:0.000 1st Qu.:0.000 3D:240 #> Median : 7.00 Median :1.300 Median :1.900 NO:168 #> Mean : 36.65 Mean :1.691 Mean :1.938 #> 3rd Qu.: 15.50 3rd Qu.:2.500 3rd Qu.:3.200 #> Max. :1107.00 Max. :9.900 Max. :8.400 #> NA's :198 #> sft_group geometry #> TTP-041 :223 POINT :445 #> TTP-058 :222 epsg:NA: 0 #> active_group: id: 0 #> #> #> #>