On Wed, 29 Jun 2005, Duncan Murdoch wrote:
> I'm trying to track down a bug in some experimental code, where an
> object's attribute is getting messed up. This means I'd like to examine
> R objects while within gdb.
>
> One of the things I'd like to do is to examine the names of all the
> attributes. This is exactly what an example in the R Extensions manual
> section 4.11.2 "Inspecting R objects when debugging" does, but the code
> there doesn't work, presumably because the R internals have changed
> since it was written.
>
> Specifically, I get
>
> (gdb) p $a->u.listsxp.tagval->u.symsxp.pname->u.vecsxp.type.c
> Error: There is no member named vecsxp.
>
Something like this I think (untested):
p ((VECSEXP)$a->u.listsxp.tagval->u.symsxp.pname)->vecsxp.type.c
luke
> where $a was set to be the attrib member of an SEXP.
>
> Could someone let me know what needs to be fixed for this to work? I
> imagine it's a typecast, but I haven't been able to put it together.
>
> (An example using R_PV to print the attributes of an SEXP would also be
> welcome, but I can probably figure that one out once I get this...)
>
> Duncan Murdoch
>
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--
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: [EMAIL PROTECTED]
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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