On 12-02-14 10:58 PM, Jooil Kim wrote:
Hello,
I'm wondering if I can get some help with reading Fortran binary "unformatted"
output files into R.
The Fortran output files were generated in Ubuntu 10.04 LTS using gfortran4.4,
on a 32bit Intel Core 2 Duo 3.16 GHz machine, with little-endian and record
marker lengths equal to 4.
The machine I'm currently trying to read this Fortran output file is a Macbook
Pro running Lion 10.7.3, on a 2.26 GHz Intel Core 2 Duo with 4Gb of ram. I'm
running R 2.14.1.
Based on whatever information I could gather from the web, I've been trying out the
following code (the name of the Fortran output file is "header", located in the
current working directory).
to.read<- file("header", "rb")
readBin(to.read, "integer", n=2, size = 4, endian = "little")
Unfortunately, these commands return empty.
Am I on the right track here? Is what I'm trying to accomplish here even
technically possible?
Yes, that should have worked. To debug, I'd replace your second line with
readBin(to.read, "raw", n=100)
For example, when I create a file by writing out 1:10 using writeBin,
that gives
> readBin(to.read, "raw", n=100)
[1] 01 00 00 00 02 00 00 00 03 00 00 00 04 00 00 00 05 00 00
[20] 00 06 00 00 00 07 00 00 00 08 00 00 00 09 00 00 00 0a 00
[39] 00 00
from which it is pretty obvious the file contains small integers in
little endian form. Paul Murrell's hexView package gives more elaborate
possibilities.
Duncan Murdoch
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