From the C code:
/* Ditto, but only for objects, for use in debugging */
so R_PV only prints for 'objects' (that is those with an S3 class, and if
properly formed, those with an S4 class). I doubt a set of names has a
class: to print those, use Rf_PrintValue.
I am not sure why one would want to confine attention to 'objects', but
the code has been that way 'for ever' (8 years).
On Tue, 6 May 2008, Duncan Murdoch wrote:
On 06/05/2008 3:02 AM, pseudo wrote:
Dear all,
When using gdb to debug my C code, I use R_PV to show the content of
SEXP variables:
SEXP sexp; // it is a data.frame
SEXP colNames = getAttrib(sexp, R_NameSymbol);
A strange thing is that after halting the program:
(gdb) p R_PV(colNames)
does not show the content of colNames. I am positive my code is right
because if I insert "PrintValue(colNames);" in the c code, it will
print the right value. My debug result shows that the variable
"colNames" failed the "isObject" call. I am not sure whether this is a
new feature or bug. Anyone can help?
Are you sure that getAttrib has been called? Depending on the optimization
level under which your code was compiled, instructions may be re-ordered.
gdb may show the instruction pointer after that line, even though that line
hasn't been run yet.
Duncan Murdoch
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
--
Brian D. Ripley, [EMAIL PROTECTED]
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
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
