Hi Mark - Thanks for the reply. Sorry I didn't really clarify too well what I'm trying to do. The issue is not that I can't see the variable that gets loaded.
The issue is that the variable is a list variable, and I'd like to write a function that will take the .RData filename and attach the variable it contains so that I can more easily access its contents, i.e. foo.bar <- list( "a"= "a", "b"=1 ) save( file="foo.bar.RData", foo.bar ) rm( foo.bar ) my.fn <- function( fname ) { load( fname ) attach( ls( pat="foo" ) ) # I want to attach( foo.bar ), but this doesn't work } ls() # prints out "foo.bar" attach( ls( ) ) # still doesn't work attach( foo.bar ) # works So, basically, the question is how can I attach the variable that's stored in a file if I don't already know it's name? Thanks again! Peter Leeds, Mark (IED) wrote: > I don't think I understand your question but John Fox has written a very > nice documentat about scoping and environments on his website. > It's probably easy to find the site by googling "John Fox" but, if you > can't find it, let me know. > > As I said, I don't think that I understand your question but, if you > loaded a list variable using load("whatever.Rdata"), the variable will > just be suitting in your workspace. You don't need to attach anything > because load just loads the data right into the workspace. > So typing the variable name should show the data. > > > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Peter Waltman > Sent: Thursday, September 20, 2007 1:32 PM > To: r-help@r-project.org > Subject: [R] how can I attach a variable stored in > > Hi - > > Any help would be greatly appreciated. > > I'm loading a list variable that's stored in an .RData file and would > like attach it. > > I've used attach( <file_name> ), but that only lets me see the variable > that's stored in the file. > > As the variable name is of the form "comp.x.x", I've tried using attach( > ls( pat="comp" ) ), but get an error as ls() just gives back a string. > > I've also played around with eval(), but don't really quite get what > that function does since it seems to get into the R internals which I > don't entirely understand and I haven't found any great unified > documentation on R's handling environment and scoping. > > Thanks, > > Peter Waltman > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -------------------------------------------------------- > > This is not an offer (or solicitation of an offer) to buy/sell the > securities/instruments mentioned or an official confirmation. Morgan Stanley > may deal as principal in or own or act as market maker for > securities/instruments mentioned or may advise the issuers. This is not > research and is not from MS Research but it may refer to a research > analyst/research report. Unless indicated, these views are the author's and > may differ from those of Morgan Stanley research or others in the Firm. We > do not represent this is accurate or complete and we may not update this. > Past performance is not indicative of future returns. For additional > information, research reports and important disclosures, contact me or see > https://secure.ms.com/servlet/cls. You should not use e-mail to request, > authorize or effect the purchase or sale of any security or instrument, to > send transfer instructions, or to effect any other transactions. We cannot > guarantee that any such requests received vi! a e-mail will be processed in a timely manner. This communication is solely for the addressee(s) and may contain confidential information. We do not waive confidentiality by mistransmission. Contact me if you do not wish to receive these communications. In the UK, this communication is directed in the UK to those persons who are market counterparties or intermediate customers (as defined in the UK Financial Services Authority's rules). > > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.