| pkg_is_installed | R Documentation | 
Note: this function differs from rlang::is_installed() in two regards: it is quieter and will
show no messages, and it returns a vector indicating which packages are installed or not (rather
than a single Boolean value regarding the packages as a set).
pkg_is_installed(pkgs)
pkgs | 
 Character vector of the names of the packages to check.  | 
Logical vector indicating whether the packages are installed.
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