check.packages: Check if a package can be loaded

In Xmisc: Xiaobei's miscellaneous classes and functions

Description

Check if a package can be loaded. If TRUE, load it as long as it has not yet been loaded.

Usage

check.packages(x, envir = sys.frame(sys.parent(0)), character.only = FALSE)

Arguments

x	package, see library or require.
envir	the environment to use.
character.only	see library or require.

Value

logical, whether a package can be loaded.

Author(s)

Xiaobei Zhao

See Also

is.package.loaded

Examples

check.packages("Xmisc")
check.packages(Xmisc)
x <- "Xmisc"
check.packages(x,character.only=TRUE)

Xmisc documentation built on May 2, 2019, 8:23 a.m.