ffbase2 (version 0.2)

manip_grouped_ffdf: Data manipulation for grouped data tables.

Description

Data manipulation for grouped data tables.

Usage

"filter_"(.data, ..., .dots)
"summarise_"(.data, ..., .dots)
mutate.grouped_ffdf(.data, ..., inplace = FALSE)
"arrange_"(.data, ..., .dots)
"slice_"(.data, ..., .dots)

Arguments

.data

a data table

...

variables interpreted in the context of .data

inplace

if FALSE (the default) the data frame will be copied prior to modification to avoid changes propagating via reference.

Examples

species <-
  iris %>% tbl_ffdf %>%
  group_by(Species)
filter(species, Petal.Width == max(Petal.Width))
summarise(species, Petal.Width=mean(Petal.Width))