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.
# NOT RUN {
## 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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