doj: Perform data.table calculations within pipe chains

In thomasgstewart/tgsify: A Collection of R Functions

Description

Perform a data.table calculation dt[,j,by] or dt[,j] within a pipe chain (%>%) .

Usage

jby(data, expr_j, expr_by)

doj(data, expr_j)

Arguments

data	A data.table object, say dt
expr_j	The j expression for dt[,j,by]
expr_by	The by expression for dt[,j,by]

Details

Allows dt[,j,by] or dt[,j] calculations within a pipe chain, such as

iris %>% as.data.table %>% doj(mean(Sepal.Length)) %>% print

Examples

require(data.table); require(dplyr);
iris %>% 
  as.data.table %>% 
  jby(mean(Sepal.Length),Species) %>% 
  print
require(data.table); require(dplyr);
iris %>% 
  as.data.table %>% 
  doj(mean(Sepal.Length)) %>% 
  print

thomasgstewart/tgsify documentation built on June 18, 2020, 11:10 a.m.