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% File src/library/base/man/zpackages.Rd
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% File src/library/base/man/zpackages.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2011 R Core Team
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% Copyright 1995-2012 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{zpackages}
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\name{zpackages}
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\title{Listing of Packages}
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\title{Listing of Packages}
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\alias{.packages}
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\alias{.packages}
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  report a package as available if the metadata does not match the
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  report a package as available if the metadata does not match the
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  directory name: use \code{\link{find.package}} to confirm that the
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  directory name: use \code{\link{find.package}} to confirm that the
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  metadata match or \code{\link{installed.packages}} for a much slower
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  metadata match or \code{\link{installed.packages}} for a much slower
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  but more comprehensive check of \sQuote{available} packages.
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  but more comprehensive check of \sQuote{available} packages.
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}
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}
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\note{
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   \code{.packages(all.available = TRUE)} is not a way to find out if a
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  small number of packages are available for use: not only is it
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  expensive when thousands of packages are installed, it is an
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  incomplete test.  See the help for \code{\link{find.package}} for why
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  \code{\link{require}} should be used.
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}
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\value{
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\value{
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  A character vector of package base names, invisible unless
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  A character vector of package base names, invisible unless
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  \code{all.available = TRUE}.
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  \code{all.available = TRUE}.
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}
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}
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\author{
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\author{