[R] bus error macosx/off-topic

[Prof Brian Ripley]

On Thu, 13 May 2004, Ingmar Visser wrote:

> Dear Prof Ripley,
> Thanks for your answer.
> 
> On 5/12/04 2:52 PM, "Prof Brian Ripley" <ripley at stats.ox.ac.uk> wrote:
> 
> > These normally occur (at that point) from having written off one end of an
> > array. (If you are using .C/.Fortran, they try to copy back the
> > arguments.) Compiling with bounds checking turned on can help, at least
> > with Fortran.
> 
> Can I invoke compile options if/when I use R cmd install etc. to install
> packages? 

By using a Makevars file: see Writing R Extensions.

> The situation is this: I pass arguments from R to C, then most of these are
> passed on to a Fortran routine, and then the same way back.
> 
> I suppose that at the end of the C-routine the arguments are copied back to
> R. Where/who or what decides what the length of a vector is that is passed
> back to R?

You do. It's the same length as you passed in.


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595