R packages are combinations of functions and data sets created as extensions to R. While, library in R indicates the place where the package is held.
Install packages
install.packages('ggplot2') # ggplot2 is An implementation of the grammar of graphics in R
To install more than one packages together
install.packages(c("dplyr", "devtools", "foreign"))
#dplyr package is a grammar of data manipulation
#devtools package is a combination of package development tools
#foreign package used for read data stored by other statistical software such as Minitab, S, SAS, SPSS, and Stata.
You can also install packages from RGui: Packages> Install package(s)
and from RStudio from: Tools>Install Packages
Call packages
Before using any packages you have to load them using library function.
library(ggplot2) # to load functions from the package we have to call it.
Remove packages
You can remove any packages that you do not need:
remove.packages("ggplot2") # for remove a package
Update packages
Check old packages that need an update
old.packages()
# for update all packages
update.packages()
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