Can I run R code straight from R src (.R) file instead of .rdb/.rdx?  I of
course tried simply unzipping tar.gz in the R_LIBS directory but R complains
with "not a valid installed package".

Real issue: I am very new to R and all, so this could be something basic.
 I'm trying to use ess-tracebug (Emacs front-end to trace/browser et al).
 It works great when I trace functions in .R files because browser outputs
filename+line-number when it hits a breakpoint. i.e. something like this:

debug at /home/lgd/test/R/test3.R#1: {

It even moves the cursor as you step through the function.  This is just
lovely as I'm sure everyone knows.  However, in case of a trace on function
in a package (ie loaded from a .rdb/.rdx) there is no filename/linenum
information probably because its not retained.  i.e. it prints something
like this:

debugging in: train(net, P, target, error.criterium = "LMS", report = TRUE,

Any way to work around this?  Thanks for all insights.

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