On Feb 15, 2012, at 5:41 AM, Duncan Murdoch wrote:
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).
Jooil Kim;
Are you sure that is the complete file name? The MacOS (like Windows)
will hide the extensions of some files when using Finder.app unless
you change the defaults.
--
David.
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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David Winsemius, MD
West Hartford, CT
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
