On 13-02-02 2:23 PM, Andrew DeCarlo wrote:
Hello,
I am a developer working on extracting information from .rdata files using
java. I have been looking through the documentation a lot trying to figure
out how to read these files, but am a bit stuck at the moment.
I have generated two .RDATA files from StatTransfer and have noticed that
they both begin in similar ways.
*File 1*
RDA2
A
2
131585
66560
1026
1
4105
10
.Traceback
254
1026
1
4105
*8 <- these are the only difference*
SPSSTest <-FileName
787
*
*
*File 2*
RDA2
A
2
131585
66560
1026
1
4105
10
.Traceback
254
1026
1
4105
*9 **<- these are the only difference*
statatest <-FileName
787
Because of the remarkable similarity between these two beginning segments I
assume that this is some sort of header. After examining the R Internals
Manual (Section 1.8) I was able to discover that the first line describes
the file RDA2 means its an ascii data file opposed to XDR or word order
binary and the 2 indicates that it is version 2 of R. After this first line
there are supposed to be 3 integers that also describe the version.
However this is pretty much where section 1.8 ends and even though I
searched through the rest of the document (and a lot of Google) I couldn't
find anything about what the rest of the bytes/numbers indicate. I may just
be missing something (I have seen a lot of people reference the Internals
Manual) but is there any documentation on the different data files (RDA,
RDX, RDB) and how they are organized.
Any info would be greatly appreciated. Thanks a bunch!
You could try the source code: the files are written by the code in
https://svn.r-project.org/R/trunk/src/main/serialize.c
The comments in there describe it, and the code does what it does.
Duncan Murdoch
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