On 18/09/2008, at 9:50 AM, <[EMAIL PROTECTED]> 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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