R Question
Odd behaviour of library() function in R
When I included janitor package with other packages, it did not load.
library(MASS, caret, stepPlr, janitor)
Error in library(MASS, caret, stepPlr, janitor) : object 'janitor' not found
When I ran that command separately with only janitor package, it got loaded into session; with no error
> library(janitor)
Warning message:
package ‘janitor’ was built under R version 3.3.3
Is there any limit with including x number of packages at a time? Or there is something wrong with my RStudio?
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Answer Source
The library() function isn't meant to load multiple libraries, a better approach is to create a list of packages, and use require() to check if they are installed and if not install them. See example below:
requiredPackages <- c("MASS", "caret", "stepPlr", "janitor")
ipak <- function(pkg){
new.pkg <- pkg[!(pkg %in% installed.packages()[, "Package"])]
if (length(new.pkg))
install.packages(new.pkg, dependencies = TRUE)
sapply(pkg, require, character.only = TRUE)
}
ipak(requiredPackages)
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