By: Apply a Function to a Data Frame Split by Factors

In kkholst/lava: Latent Variable Models

Apply a Function to a Data Frame Split by Factors

Description

Apply a Function to a Data Frame Split by Factors

Usage

By(x, INDICES, FUN, COLUMNS, array = FALSE, ...)

Arguments

x	Data frame
INDICES	Indices (vector or list of indices, vector of column names, or formula of column names)
FUN	A function to be applied to data frame subsets of 'data'.
COLUMNS	(Optional) subset of columns of x to work on
array	if TRUE an array/matrix is always returned
...	Additional arguments to lower-level functions

Details

Simple wrapper of the 'by' function

Author(s)

Klaus K. Holst

Examples

By(datasets::CO2,~Treatment+Type,colMeans,~conc)
By(datasets::CO2,~Treatment+Type,colMeans,~conc+uptake)

kkholst/lava documentation built on Feb. 22, 2024, 4:07 p.m.