by-lapply: Formula based version of lapply and sapply

In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

Formula based version of lapply and sapply

Description

This function is a wrapper for calling lapply on the list resulting from first calling splitBy.

Usage

lapply_by(data, formula, FUN, ...)

lapplyBy(formula, data = parent.frame(), FUN, ...)

sapply_by(data, formula, FUN, ..., simplify = TRUE, USE.NAMES = TRUE)

sapplyBy(
  formula,
  data = parent.frame(),
  FUN,
  ...,
  simplify = TRUE,
  USE.NAMES = TRUE
)

Arguments

data	A dataframe.
formula	A formula describing how data should be split.
FUN	A function to be applied to each element in the split list, see 'Examples' below.
...	optional arguments to FUN.
simplify	Same as for sapply
USE.NAMES	Same as for sapply

Value

A list.

Author(s)

Søren Højsgaard, [e-mail]

See Also

splitBy, split_by

Examples

fun <- function(x) range(x$uptake)
lapplyBy(~Treatment + Type, data=CO2, FUN=fun)
sapplyBy(~Treatment + Type, data=CO2, FUN=fun)

# Same as
lapply(splitBy(~Treatment + Type, data=CO2), FUN=fun)

doBy documentation built on Oct. 8, 2024, 1:06 a.m.