R: On-demand loading of packages

On-demand loading of packages

Usage

autoload(name, file)
autoloader(name, file)
.AutoloadEnv

Arguments

`name`	string giving the name of an object
`file`	string giving the name of a package containing the object

Description

autoload creates a promise-to-evaluate autoloader and stores it with name name in .AutoloadEnv environment. When R attempts to evaluate name, autoloader is run, the package is loaded and name is re-evaluated in the new package's environment. The result is that R behaves as if file was loaded but it does not occupy memory.

Value

see description

Examples

autoload("line","eda")
search()
ls("Autoloads")
all(ls("Autoloads") == ls(envir = .AutoloadEnv))
data(cars)
plot(cars)
z<-line(cars)
abline(coef(z))
search()
detach("package:eda")
search()
z<-line(cars)
search()