Find (or retrieve) details of all packages installed in the specified libraries.
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character vector describing the location of R library trees to
search through, or
character vector or
Do not use cached information, nor cache it.
a character vector giving the fields to extract from
character string or
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
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 running
installed.packages(noCache = TRUE).
A matrix with one row per package, row names the package names and
column names (currently)
"Built" (the R version the package was built under).
Additional columns can be specified using the
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
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.
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