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SwampThingPaul/package_install.r

Created February 15, 2020 01:55
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check and install packages
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package_install.r
## Function to check and install packages
## If package is installed, then the function moves to the next.
check.packages <- 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)
}
pkg=c("lubridate","plyr","reshape","maptools","classInt",
"GISTools","zoo","colorRamps","dataRetrieval","leaflet","RcppRoll",
"rvest","readr","rjson","kableExtra","knitr")
check.packages(pkg)
warnings()
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