[R-SIG-Mac] lme4 crashes R

Duncan Temple Lang duncan at wald.ucdavis.edu
Fri Aug 6 14:17:52 CEST 2004

For what its worth, I'll just mention the small point that this is
place where the registration mechanism for routines 
access via the .Call/.C/.Fortran/.External would help.

The change is
-          sc = .Call("ssclme_sigma", object, PACKAGE = "Matrix")
+          sc = .Call("ssclme_sigma", object, REML, PACKAGE = "Matrix")
and if ssclme_sigma  were registered with the entry

  {"ssclme_sigma", (DL_FUNC) &ssclme_sigma, 2}

the .Call() mechanism would throw an error in the case that the routine was called
with only one argument.  Type information is also specifiable.

As I say, just a small point.


Douglas Bates wrote:
> Simon Urbanek wrote:
> >On Aug 5, 2004, at 12:55 PM, Andrew Beckerman wrote:
> >
> >>has anyone had success at building and running the source distribution 
> >>of lme4 from CRAN on OSX?  I find that it builds, and will load as a 
> >>library, but running the lme example in lme4 causes R to crash - the 
> >>data file loads, the model appears to run, but attempting a summary() 
> >>or print() causes the crash.
> >
> >
> >It's a bug which is not OS X specific. Attached you'll find a patch with 
> >the fix. I suspect that the reason is that lme4 uses direct calls to C 
> >code of Matrix (why doesn't Matrix provide R-level interface for this? I 
> >thought calling C code of another package is strongly discouraged...), 
> >the interface changed and one of those calls was not fixed.
> The reason that the R code in lme4 calls C code from the Matrix package 
> directly is the usual reason - efficiency - and an unusual reason - some 
> of the C code in for use with the lme4 models requires access to some of 
> the sparse matrix code in C.  You can have an R function in package A 
> call a C function in package B but you can't have a C function in 
> package A call a C function in package B.  Thus we need to put all the C 
> code for the lme4 package in the Matrix package.
> Thanks for the reminder.
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Duncan Temple Lang                        duncan at wald.ucdavis.edu
 371, Kerr Hall
 University of California at Davis

Phone: (530) 752-4782
FAX:   (530) 752-7099

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