我最近从R-2.11.1安装了R-2.12.0，并通过以下方式更新了所有CRAN软件包：
update.packages(checkBuilt=TRUE, ask=FALSE)
现在我想更新我从R-forge安装的所有软件包，但只有当它们在CRAN上不可用时。换句话说，我不能简单地运行：
update.packages(checkBuilt=TRUE, ask=FALSE, repos="http://r-forge.r-project.org")
因为它将在R-2.12.0附带的版本上安装生存包的R-forge版本。
我可能可以使用old.packages和packageStatus中的一些信息组合来确定哪些包只存在于R-forge上，但我想问在构建自定义解决方案之前是否有更简单的方法。
这个怎么样：
# 1. Get the list of packages you have installed,
# use priority to exclude base and recommended packages.
# that may have been distributed with R.
pkgList <- installed.packages(priority= NA )[, Package ]
# 2. Find out which packages are on CRAN and R-Forge. Because
# of R-Forge build capacity is currently limiting the number of
# binaries available, it is queried for source packages only.
CRANpkgs <- available.packages(
contriburl=contrib.url( http://cran.r-project.org ))[, Package ]
forgePkgs <- available.packages(
contriburl=contrib.url( http://r-forge.r-project.org , type= source )
)[, Package ]
# 3. Calculate the set of packages which are installed on your machine,
# not on CRAN but also present on R-Force.
pkgsToUp <- intersect(setdiff(pkgList, CRANpkgs), forgePkgs)
# 4. Update the packages, using oldPkgs to restrict the list considered.
update.packages(checkBuilt=TRUE, ask=FALSE,
repos="http://r-forge.r-project.org",
oldPkgs=pkgsToUp)
# 5. Profit?
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