output, cloud...)

filter_count

R Documentation

Count observations dropped from data.table by running expr and save as attribute

Description

Count observations dropped from data.table by running expr and save as attribute

Usage

filter_count(dt, fields, key_name, expr)

Arguments

`dt`	data.table to transform and summarize
`fields`	string or vector of strings, sets of fields to summarize the observations by. Use "-" between column names to summarize by multiple fields. Use a single "*" to return the unconditional number of rows of the data.table
`key_name`	string list key to save the statistics under, in the "log" attribute of the data.table
`expr`

Value

input data.table after transform from expr

Examples

iris_dt <- as.data.table(iris)
iris_dt <- filter_count(iris_dt, c("*", "Species", "Species-Petal.Width"),
  "setosa-only", { iris_dt[Species == "setosa"] })
attr(iris_dt, "log")

fcocquemas/hfty.helpers documentation built on Feb. 13, 2023, 7:25 a.m.