utils (version 3.6.2)

installed.packages: Find Installed Packages


Find (or retrieve) details of all packages installed in the specified libraries.


installed.packages(lib.loc = NULL, priority = NULL,
                   noCache = FALSE, fields = NULL,
                   subarch = .Platform$r_arch, …)



character vector describing the location of R library trees to search through, or NULL for all known trees (see .libPaths).


character vector or NULL (default). If non-null, used to select packages; "high" is equivalent to c("base", "recommended"). To select all packages without an assigned priority use priority = "NA".


Do not use cached information, nor cache it.


a character vector giving the fields to extract from each package's DESCRIPTION file in addition to the default ones, or NULL (default). Unavailable fields result in NA values.


character string or NULL. If non-null and non-empty, used to select packages which are installed for that sub-architecture.

allows unused arguments to be passed down from other functions.


A matrix with one row per package, row names the package names and column names (currently) "Package", "LibPath", "Version", "Priority", "Depends", "Imports", "LinkingTo", "Suggests", "Enhances", "OS_type", "License" and "Built" (the R version the package was built under). Additional columns can be specified using the fields argument.


installed.packages scans the DESCRIPTION files of each package found along lib.loc and returns a matrix of package names, library paths and version numbers.

The information found is cached (by library) for the R session and specified fields argument, and updated only if the top-level library directory has been altered, for example by installing or removing a package. If the cached information becomes confused, it can be avoided by specifying noCache = TRUE.

See Also

update.packages, install.packages, INSTALL, REMOVE.


Run this code
## confine search to .Library for speed
str(ip <- installed.packages(.Library, priority = "high"))
ip[, c(1,3:5)]
plic <- installed.packages(.Library, priority = "high", fields = "License")
## what licenses are there:
table( plic[, "License"] )
# }

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