[Rd] stack imbalance in max.col for non-real matrices

[Prof Brian Ripley]

On 17/04/2013 21:25, Michael Lawrence wrote:
> It's tough to reliably reproduce, but I often get stack imbalance warnings
> when calling max.col() on non-real/double matrix. The code is conditionally
> PROTECTing but not incrementing its nprot counter for the eventual
> UNPROTECT. Pretty sure this would fix (but I haven't tested it):

I can't reproduce it either, but that seems the right fix so 
incorporated now, thanks.

>
> Index: array.c
> ===================================================================
> --- array.c    (revision 61606)
> +++ array.c    (working copy)
> @@ -1614,7 +1614,10 @@
>       SEXP m = CAR(args);
>       int method = asInteger(CADR(args));
>       int nr = nrows(m), nc = ncols(m), nprot = 1;
> -    if (TYPEOF(m) != REALSXP) PROTECT(m = coerceVector(m, REALSXP));
> +    if (TYPEOF(m) != REALSXP) {
> +      PROTECT(m = coerceVector(m, REALSXP));
> +      nprot++;
> +    }
>       SEXP ans = allocVector(INTSXP, nr);
>       PROTECT(ans);
>       R_max_col(REAL(m), &nr, &nc, INTEGER(ans), &method);
>
> Thanks,
> Michael
>
> 	[[alternative HTML version deleted]]
>
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-- 
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)
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