| installed.packages {utils} | R Documentation |
Find (or retrieve) details of all packages installed in the specified libraries.
installed.packages(lib.loc = NULL, priority = NULL,
noCache = FALSE, fields = NULL)
lib.loc |
character vector describing the location of R library trees to search through. |
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. |
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. |
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.
Note: this works with package names, not bundle names, and
for versioned installs with the name under which the package is
installed, in the style mypkg_1.3-7.
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).
A matrix with one row per package, row names the package names and
column names "Package", "LibPath", "Version",
"Priority", "Bundle", "Contains",
"Depends", "Suggests", "Imports" and
"Built" (the R version the package was built under).
Additional columns can be specified using the fields
argument.
update.packages, INSTALL, REMOVE.
str(ip <- installed.packages(priority = "high")) ip[, c(1,3:5)] plic <- installed.packages(priority = "high", fields="License") ## what licenses are there: table( plic[,"License"] )