On 01.06.2013 14:58, Uwe Ligges wrote:


On 01.06.2013 02:02, Ranjan Maitra wrote:
On Fri, 31 May 2013 18:10:19 -0500 Robert Baer <rb...@atsu.edu> wrote:

On 5/31/2013 11:59 AM, Ranjan Maitra wrote:
Hi John,

I suspect you may be missing a c()?

On Fri, 31 May 2013 06:05:45 -0800 John Kane <jrkrid...@inbox.com>
wrote:

paks  <-  install.packages( "Hmisc", "plyr")
paks <- install.packages( c("Hmisc", "plyr"))


    install.packages(paks)
You can use the command  library()  to get a list of what is
installed on your machine.
Is it possible to get this as a vector of only the package names, or
is post-processing the output of library() the only way out?
Do you mean something like:
paks = library()$results[,1]
save(paks, file = 'paks.RData')
Rob

Exactly! Then

install.packages(library()$results[,1])

does all the updated installs in one shot.


Why do you want to reinstall all packages?

I'd go for
udpate.packages(checkBuilt=TRUE)
if a reinstallation after an update of R is what you are aiming at.


.... and forgot to add: installed.packages() is certainly more appropriate than library() to find the names of installed packages (with less overhead and hence faster).

Best,
Uwe Ligges

Best,
Uwe Ligges



Thanks!
Ranjan

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