[Rd] Dynamic list creation (SEXP in C) returns error "unimplemented type (29) in 'duplicate'"

[George Vega Yon]

I'll use it and share the output with you. Thanks!
George Vega Yon
+56 9 7 647 2552
http://ggvega.cl


2013/11/5 Prof Brian Ripley <ripley at stats.ox.ac.uk>:
> On 05/11/2013 21:12, Gabriel Becker wrote:
>>
>> George,
>>
>> I don't see the relevance of the stackoverflow post you linked. In the
>> post, the author wanted to change the length of an existing "mother list"
>> (matrix, etc), while you specifically state that the length of L1 will not
>> change.
>>
>> You say that the child lists (vectors if they are INTSXP/REALSXP) are
>> variable, but that is not what the linked post was about unless I am
>> completely missing something.
>>
>> I can't really say more without knowing the details of how the vectors are
>> being created and why they cannot just have the right length from the
>> start.
>>
>> As for the error, that is a weird one. I imagine it means that a SEXP
>> thinks that it has a type other than ones defined in Rinternals. I can't
>> speak to how that could have happened from what you posted though.
>
>
> Usually it is the result of garbage collection: something which should have
> been protected and is not has been re-used.
>
> The way to find such things is to use a valgrind-instrumented build of R:
> see 'Writing R Extensions'.  Possibly with gcorture(TRUE) to make it
> reproducible.
>
>
>
>>
>> Sorry I can't be of more help,
>> ~G
>>
>>
>>
>> On Mon, Nov 4, 2013 at 8:00 PM, George Vega Yon <g.vegayon at gmail.com>
>> wrote:
>>
>>> Dear R-devel,
>>>
>>> A couple of weeks ago I started to use the R C API for package
>>> development. Without knowing much about C, I've been able to write
>>> some routines sucessfully... until now.
>>>
>>> My problem consists in dynamically creating a list ("L1") of lists
>>> using .Call, the tricky part is that each element of the "mother list"
>>> contains two vectors (INTSXP and REALEXP types) with varying sizes;
>>> sizes that I set while I'm looping over another list's ("L1") elements
>>>   (input list). The steps I've follow are:
>>>
>>> FIRST: Create the "mother list" of size "n=length(L0)" (doesn't
>>> change) and protect it as
>>>    PROTECT(L1=allocVector(VECEXP, length(L0)))
>>> and filling it with vectors of length two:
>>>    for(i=0;i<n;i++) SET_VECTOR_ELT(L1,i, allocVector(VECSXP, 2));
>>>
>>> then, for each element of the mother list:
>>>
>>>    for(i=0;i<n;i++) {
>>>
>>> SECOND: By reading this post in Stackoverflow
>>>
>>>
>>> http://stackoverflow.com/questions/7458364/growing-an-r-matrix-inside-a-c-loop/7458516#7458516
>>> I understood that it was necesary to (1) create the "child lists" and
>>> protecting them with PROTECT_WITH_INDEX, and (2) changing its size
>>> using SETLENGTH (Rf_lengthgets) and REPROTECT ing the lists in order
>>> to tell the GC that the vectors had change.
>>>
>>> THIRD: Once my two vectors are done ("id" and "lambda"), assign them
>>> to the i-th element of the "mother list" L1 using
>>>    SET_VECTOR_ELT(VECTOR_ELT(L1,i), 0, duplicate(id));
>>>    SET_VECTOR_ELT(VECTOR_ELT(L1,i), 1, duplicate(lambda));
>>>
>>> and unprotecting the elements protected with index: UNPROTECT(2);
>>>
>>> }
>>>
>>> FOURTH: Unprotecting the "mother list" (L1) and return it to R
>>>
>>> With small datasets this works fine, but after trying with bigger ones
>>> R (my code) keeps failing and returning a strange error that I haven't
>>> been able to identify (or find in the web)
>>>
>>>    "unimplemented type (29) in 'duplicate'"
>>>
>>> This happens right after I try to use the returned list from my
>>> routine (trying to print it or building a data-frame).
>>>
>>> Does anyone have an idea of what am I doing wrong?
>>>
>>> Best regards,
>>>
>>> PS: I didn't wanted to copy the entire function... but if you need it
>>> I can do it.
>>>
>>> George Vega Yon
>>> +56 9 7 647 2552
>>> http://ggvega.cl
>>>
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>
>>
>>
>
>
> --
> 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)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595