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, or |
priority |
character vector or |
noCache |
Do not use cached information. |
fields |
a character vector giving the fields to extract from
each package's |
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.
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"] )