inst/examples/add-count-tally-examples.R

In terminological/dtrackr: Track your Data Pipelines

library(dplyr)
library(dtrackr)

# mutate and other functions are unitary operations that generally change
# the structure but not size of a dataframe. In dtrackr these are by ignored
# by default but we can change that so that their behaviour is obvious.

# add_count
# adding in a count or tally column as a new column
iris %>%
  track() %>%
  add_count(Species, name="new_count_total",
            .messages="{.new_cols}",
            # .messages="{.cols}",
            .headline="New columns from add_count:") %>%
  history()

# add_tally
iris %>%
  track() %>%
  group_by(Species) %>%
  dtrackr::add_tally(wt=Petal.Length, name="new_tally_total",
            .messages="{.new_cols}",
            .headline="New columns from add_tally:") %>%
  history()