Nothing
library(dplyr)
library(dtrackr)
# the first 50% of the data frame, is taken and the history tracked
iris %>% track() %>% group_by(Species) %>%
slice_head(prop=0.5,.messages="{.count.out} / {.count.in}",
.headline="First {sprintf('%1.0f',prop*100)}%") %>%
history()
# The last 100 items:
iris %>% track() %>% group_by(Species) %>%
slice_tail(n=100,.messages="{.count.out} / {.count.in}",
.headline="Last 100") %>%
history()
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