[R] using compiled fortran in R

[Martin Maechler]

>>>>> "Natalie" == Natalie Hawkins <hawkins at scharp.org> writes:

    Natalie> I would like to use a Fortran subroutine in R.  I have checked
    Natalie> the R docs and Newsletter, but..., I am unable to load an
    Natalie> object file into R.

    Natalie> The steps I have taken are (on Debian Linux/recent Intel-type
    Natalie> chip ):

    Natalie> 1. g77 -c hello.f
    Natalie> to create hello.o

You should say
	   R CMD SHLIB hello.f
which will create
      hello.so 
in one step.
Alternatively
	R CMD COMPILE hello.f
	R CMD SHLIB   hello.o
should do the same in two steps (useful if there are several source files)

    Natalie> 2. mymachine> R
    Natalie> to start R

    Natalie> 3. > dyn.load("hello.o")
which would then be
      dyn.load("hello.so")
and I actually always use an explicit path

    Natalie> at which point I am getting the error msg:

    Natalie> Error in dyn.load(x, as.logical(local), as.logical(now)) :
    Natalie> unable to load shared library "/home/hawkins/Rfortran/hello.o":
    Natalie> /home/hawkins/Rfortran/hello.o: ELF file's phentsize not the
    Natalie>  expected size

    Natalie> Can anyone (please) correct my procedure, offer a suggestion?

In R, try

   ?dyn.load
and
   ?SHLIB

(and yes, the next version of R will have a SEEALSO link from dyn.load to
SHLIB).




Martin Maechler <maechler at stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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