On 18/09/2008, at 9:50 AM, <kelly at inaoep.mx> wrote:
> Dear all,
>
> I want to simulate a Strauss Hard Core process in 3D. I have found
> that
> someone else tried to do the same and he recived this answer,
>
> "If you need this immediately, I suggest you follow Brian Ripley's
> advice.
> This probably involves downloading a source tar file of the R package
> and finding the Fortran code in library/spatial/src/. The Fortran
> should be
> edited to generate 3D patterns (it's not hard: everywhere you see
> 'x' and 'y'
> just include 'z'). Then also edit the R interface to the
Fortran."
>
> But I can not find the folder library/spatial/scr.
It helps to spell things correctly --- its ``src'' not ``scr''.
But that's probably not the real problem. For one thing there's
no such directory. It's more deeply buried.
> Can anyone help me with this?
Well, I don't really like your chances ... unless you're really a dab
hand
at programming. Given that you can't even find the code, this seems
unlikely!
It's all pretty obscure, anyhow. Also it's ***C*** code, and not
Fortran code. Dunno whether that's good news or bad news to you.
* First download the source tar file of the R package (currently
R-2.7.2.tar.gz.
* Make a directory to unpack it in --- so that you don't mess up
your login directory :-) --- and unpack it:
tar xfz R-2.7.2.gar.gx
* Then go to the right place:
cd R-2.7.2/src/library/Recommended/VR
* Unpack the VR bundle:
tar xfz VR_7.2-44.tar.gz
* Then go to the next right place:
cd VR/spatial
* If you look into the R source (in the directory ``R'') you'll
find
that the Strauss function is defined in terms of C functions called
VR_pdata and VR_simpat.
You'll find code for these in the src directory (in pps.c).
Good luck!!!
cheers,
Rolf Turner
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