[R] 2 questions about loading packages

From: Leeds, Mark (IED) <Mark.Leeds_at_morganstanley.com>
Date: Thu, 17 May 2007 19:19:32 -0400

My sessioninfo is below and I have two questions about loading packages in R :


R version 2.4.0 (2006-10-03)


attached base packages:

[1] "datasets"  "methods"   "utils"     "stats"     "graphics"

"grDevices" "base"
other attached packages: lattice vars strucchange sandwich fBasics fCalendar fEcofin zoo chron MASS "0.14-9" "0.5-7" "1.3-1" "2.0-0" "240.10068.1"
"240.10068" "240.10067" "1.2-2" "2.3-9" "7.2-29"
#======================================================================= =========================================
  1. The way I download packages is by downloading the necessary .tar.gz file into a directory called


and then do R CMD INSTALL -l . "gz file". Then, in my First.R, if the .gz file was say chron, I have something like



This works fine.

So, then I was going to install the lattice package but I noticed that if I just type library("lattice") at an R prompt Things seem to get loaded correctly. So, my first dumb question is why do I go through that whole process of R CMD INSTALL -l . gz file

Maybe this is because, in my. .envfile, my path is set as


so maybe it finds the lattice package over there when you type library("whatever") ? But my .libpaths is only set to the lib_new directory
so I'm kind of confused because I thought .libPaths was for poiting to a place where the packages were ?

2) if there is a reason to still use R CMD INSTALL -l . gz file, then, if a package on CRAN says "depends on 2.5.0", Is it still okay to go through that R CMD INSTALL -l . process if you are using say R.2.4.0 or does the "depends" mean that the package will not work.

Thanks for your patience and any insights. I'm obviously not understanding things very well and would like to change this as much as I can.

This is not an offer (or solicitation of an offer) to buy/se...{{dropped}}

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