[R] Querying RData Files, SQL style?
dwinsemius at comcast.net
Fri Jul 15 17:42:24 CEST 2011
On Jul 15, 2011, at 10:29 AM, Bhushan, Vipul wrote:
> Hello. Is there a package or functionality available somewhere which
> will allow for complex searches (such as what SQL can do) of
> collections of RData files? Search capability within a given RData
> file at a time (which could be put in a loop) would be good, but the
> capability to perform joins to data across multiple RData files
> would be great. These queries might be ad-hoc, so writing an R
> program to get(load(...)) each file and customize the search in home-
> grown R code isn't feasible.
As I read the question it appears that your are not expecting to load
the data into R and are rather asking for a program other than R (or
Rscript or littler) to read .Rdata files and perform database joins.
As I understand it, that is not available. As I understand it, there
is not even a package that can look at .Rdata files for their object
names and structure without actual loading them.
Hoping to be corrected on either of these points.
> This shouldn't be dependent on environment details, but just in
> case: I'm running version 2.13.0 in a Unix environment (but could
> easily run in Windows too).
> Thanks very much.
David Winsemius, MD
West Hartford, CT
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