installed.packages

From utils v3.1.2 by R-core R-core@R-project.org

Find Installed Packages

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

Keywords: utilities

Usage

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

Arguments

lib.loc: character vector describing the location of R library trees to search through, or NULL for all known trees (see .libPaths).
priority: 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".
noCache: Do not use cached information, nor cache it.
fields: 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.
subarch: character string or NULL. If non-null and non-empty, used to select packages which are installed for that sub-architecture.

Details

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 refreshed by running installed.packages(noCache = TRUE).

Value

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.

Note

This can be slow when thousands of packages are installed, so do not use this to find out if a named package is installed (use system.file or find.package) nor to find out if a package is usable (call require and check the return value) nor to find details of a small number of packages (use packageDescription). It needs to read several files per installed package, which will be slow on Windows and on some network-mounted file systems.

Examples

library(utils)

## 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"] )

Documentation reproduced from package utils, version 3.1.2, License: Part of R 3.1.2

Community examples

Looks like there are no examples yet.