Thanks! # Please, can you help me understand why require( 'base' ) # works, but require( packages_i_want_to_use[1] ) # does not work?
# In require( 'base' ), what is the "first argument"? On Mon, Oct 24, 2022 at 12:29 PM Andrew Simmons <akwsi...@gmail.com> wrote: > > require(), similarly to library(), does not evaluate its first argument > UNLESS you add character.only = TRUE > > require( packages_i_want_to_use[1], character.only = TRUE) > > > On Mon, Oct 24, 2022, 12:26 Kelly Thompson <kt1572...@gmail.com> wrote: >> >> # Below, when using require(), why do I get the error message "Error >> in if (!loaded) { : the condition has length > 1" ? >> >> # This is my reproducible code: >> >> #create a vector with the names of the packages I want to use >> packages_i_want_to_use <- c('base', 'this_pac_does_not_exist') >> >> # Here I get error messages: >> require( packages_i_want_to_use[1] ) >> #Error in if (!loaded) { : the condition has length > 1 >> >> require( packages_i_want_to_use[2] ) >> #Error in if (!loaded) { : the condition has length > 1 >> >> # Here I get what I expect: >> require('base') >> >> require('this_pac_does_not_exist') >> #Loading required package: this_pac_does_not_exist >> #Warning message: >> #In library(package, lib.loc = lib.loc, character.only = TRUE, >> logical.return = TRUE, : >> # there is no package called ‘this_pac_does_not_exist’ >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.