R: Recursively Apply a Function to a List of Data Objects

rapply2d {collapse}

R Documentation

Recursively Apply a Function to a List of Data Objects

Description

rapply2d is a recursive version of lapply with two key differences to rapply: (1) Data frames are considered as final objects, not as (sub-)lists, and (2) the result is never simplified / unlisted.

Usage

rapply2d(l, FUN, ..., classes = "data.frame")

Arguments

`l`	a list.
`FUN`	a function that can be applied to all elements in l.
`...`	additional elements passed to FUN.
`classes`	character. These are classes of list-based objects inside `l` which `FUN` should be applied to. Note that `FUN` is also applied to all non-list elements in `l`. It is thus quite different from the `classes` argument to `rapply`.

Value

A list of the same structure as l, where FUN was applied to all final (atomic) elements and list-based objects of a class included in classes.

Examples

l <- list(mtcars, list(mtcars, as.matrix(mtcars)))
rapply2d(l, fmean)
unlist2d(rapply2d(l, fmean))