On Wed, 10 Oct 2007, [EMAIL PROTECTED] wrote:
> Full_Name: Martin Schlather
> Version: R version 2.7.0 Under development (unstable) (2007-10-01 r43043)
> OS: Linux
> Submission from: (NULL) (91.3.209.203)
>
>
> Hi,
>
> There are 2 dangers with using 'DUP=FALSE' mentioned:
> * formal arguments
> * lists
>
> Would you also mention a third one, namely
> that values in R are now only referenced whenever
> possible and not always copied; hence .C(..., DUP=FALSE)
> may change the values of other local variables.
>
How about a warning like
"if you pass a local variable to .C/.Fortran with
DUP=FALSE, your compiled code can alter the local variable and not just
the copy in the return list. "
-thomas
(copied from ?.C, of course)
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
