R help - May 1998 - R-beta: How do I dyn.load in R for Windows95?

I am currently running R under Windows95.

I am entirely new to R in any environment, with no prior experience of S
or S-Plus
either.
I want to run some functions written for S-plus and residing in a file
"cat.s". The
fuctions also call some Fortran routines residing in a compiled fortran
file "cat.obj"

In S-Plus as I understand it I am supposed to first

dyn.load("cat.obj")

then

source("cat.s")

in order to run the added functions.

When I am trying this in R it seems that the R dyn.load expects a
directory name
(according to the html help-page) whereas S-Plus expects a file name.
A dyn.load("cat.obj") referencing the file name produces this error
message:

Error in dyn.load(x) : unable to load shared library
"C:\Program\r.gnw\library\cat\cat.obj"

However if I instead make a reference to the directory were my
Fortran file resides R still comes up with an error message:

dyn.load("cat")

Error in dyn.load(x) : unable to load shared library
"C:\Program\r.gnw\library\cat"

I have tried to "invoke" R  from different directories (by providing
different initial directories in the Windows95 program information file)
so it will have no reason to miss the Fortran object file. I have also
tried different suffixes to the Fortran
file such as .o and .for. I suppose I also have to rename the "cat.s"
file to "cat.R"

I have searched the Notes on R, the FAQ and naturally the html help
files but cannot find any clues.

(by the way, I have not managed to dyn.load the file (zero.c) residing
in the directory "\demos\dynload\" either)

Could anyone please come up with a solution.

Thanks very much

Thor

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Thor Thoresen writes:
> 
> I am currently running R under Windows95.
> dyn.load("cat.obj")
> 
> then
> 
> source("cat.s")
> 
> in order to run the added functions.
> 
> Error in dyn.load(x) : unable to load shared library
> "C:\Program\r.gnw\library\cat\cat.obj"
> 
> However if I instead make a reference to the directory were my
> Fortran file resides R still comes up with an error message:
> 
> dyn.load("cat")
> 
> Error in dyn.load(x) : unable to load shared library
> "C:\Program\r.gnw\library\cat"
> 
> I have tried to "invoke" R  from different directories (by
providing
> different initial directories in the Windows95 program information file)
> so it will have no reason to miss the Fortran object file. I have also
> tried different suffixes to the Fortran
> file such as .o and .for. I suppose I also have to rename the
"cat.s"
> file to "cat.R"
  You have to build a dll (dynamic link library). It is not a problem
  of suffixes. If you get the above message the file is found.
  But its format is not the one expected.
  You should be able to build a dll with the compiler that you use
  to make the cat.obj file. This dll must be self contained (see
below).
> (by the way, I have not managed to dyn.load the file (zero.c) residing
> in the directory "\demos\dynload\" either)
  This opens another question. With the actual pre-compiled  distribution
  of R for Win95 (both of them) is impossible to have a dll calling
  a routine in main executable. I hope to make available a version
  of R with this capability soon (next few days). But, in this period,
  i.e., always, time is diffucult to find.
  guido masarotto
 
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