Itemgetter: Itemgetter

In stakahama/Rfunctools: A Package for Misc. Functional Programming Tools

Description

Inspired by python's operator.itemgetter. Mostly useful for use with *apply functions.

Usage

Itemgetter(...)

Arguments

...	arbitrary indices passed to '[[' or '['

Value

A function.

Examples

List <- list(1, 2:3)
Df <- data.frame(x=1, y=2:3)
Mat <- data.matrix(Df)

ix <- Itemgetter(2)
ix(List)
ix(Df)
ix(Mat)

ix <- Itemgetter(1:2)
ix(List)
ix(Df)
ix(Mat)

ix <- Itemgetter(2, 2)
ix(Df)
ix(Mat)

ix <- Itemgetter(2, 1:2)
ix(Df)
ix(Mat)

ix <- Itemgetter(2, "y")
ix(Df)
ix(Mat)

ix <- Itemgetter(2, TRUE)
ix(Df)
ix(Mat)


ix <- Itemgetter(2, 2, drop=FALSE)
ix(Df)
ix(Mat)

ix <- Itemgetter("y")
ix(Df)

Map(Itemgetter(2), list(List, Df, Mat))

stakahama/Rfunctools documentation built on June 8, 2021, 10:25 p.m.