CODEWITHSUNDEEP
r
Tyler Rinker
Tyler Rinker

Reputation: 109844

Pass character package name to help function

This works:

help(package="ggplot2")

This does not:

x <-"ggplot2"
help(package=x)

# Error in find.package(pkgName, lib.loc, verbose = verbose) : 
#   there is no package called ‘x’

How can I make it so that I can pass x to help to open the help page?

Upvotes: 6

Views: 131

Answers (2)

IRTFM
IRTFM

Reputation: 263311

Both help and library calls for interpreting "character" class input can be constructed with do.call

 x <-"ggplot2"
 do.call(library, list(x))
 do.call(help, list(package=x))

Upvotes: 4

joran
joran

Reputation: 173527

Put the variable in parentheses:

x <-"ggplot2"
help(package=(x))

The help file for ?help rather cryptically states for the package argument:

To avoid a name being deparsed use e.g. (pkg_ref) (see the examples).

Upvotes: 6

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