On Fri, Dec 18, 2009 at 3:33 AM, Gustaf Rydevik <gustaf.ryde...@gmail.com> wrote: > On Thu, Dec 17, 2009 at 4:33 PM, Peng Yu <pengyu...@gmail.com> wrote: >> On Thu, Dec 17, 2009 at 5:33 AM, Gustaf Rydevik >> <gustaf.ryde...@gmail.com> wrote: >>> On Wed, Dec 16, 2009 at 10:13 PM, Peng Yu <pengyu...@gmail.com> wrote: >>>> >>>> Currently, I load the RData file then ls() and str(). But loading the file >>>> takes too long if the file is big. Most of the time, I only interested what >>>> the variables are in the the file and the attributes of the variables (like >>>> if it is a data.frame, matrix, what are the colnames/rownames, etc.) >>>> >>>> I'm wondering if there is any facility in R to help me avoid loading the >>>> whole file. >>> >>> >>> I thought this was interesting as well, so i did a bit of searching >>> through the R-help list archives and found this answer by Simon >>> Urbanek: >>> https://stat.ethz.ch/pipermail/r-devel/2007-August/046724.html >>> The link to a c-routine that does what you want still works, but for >>> future reference I'm pasting the code below. >> >> It doesn't work for the RData file that I saved by "save(list='test', >> file='test.RData')". >> >> $ rdcopy test.RData >> Format version 3ec, R version = 23813.88.84, release = f9db1dba >> Sorry, this tool supported RXDR version 2 format only >> > > > What happens if you remove the version check? > I.e. this one: > if (ver != 2) { > XdrInTerm(d); > error(_("Sorry, this tool supported RXDR version 2 format only\n")); > }
I commented the above lines out. But it doesn't work. $ rdcopy some.RData Format version 314, R version = -25755.184.212, release = e6164617 ReadItem: unknown type 93, perhaps written by later version of Rp > From what I can read on the hel page for ?save, there hasn't been a > change in the file format since 1.4.0.... ______________________________________________ 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.
