install.packages.ifmissing: Install Packages (If Missing)
In erikjandevries/r.dstools.ej: Data Science Tools by Erik Jan

Description Usage Arguments Details See Also Examples

Installs packages that have not already been installed.

1	install.packages.ifmissing(pkgs, lib = .libPaths(), ...)

`pkgs`	A character vector of the names of packages which should be installed if they are not installed already.
`lib`	A character vector giving the library directories where to look for and install the packages. If missing, defaults to the first element of `.libPaths()`.
`...`	Additional arguments to be passed to `install.packages`.

Installs packages that have not already been installed.

Packages are not updated with the latest version if an older version has been installed.

installed.packages which is used to determine which packages have already been installed.

install.packages which is used to install packages.

# Installs the dplyr package:
install.packages.ifmissing("dplyr")

# Installs the ggplot2 package, but
# will not reinstall the dplyr package.
install.packages.ifmissing(c("dplyr", "ggplot2"))