Re: [Rd] SEXPTYPEs
On Fri, May 16, 2014 at 2:15 PM, Prof Brian Ripley rip...@stats.ox.ac.ukwrote:
On 16/05/2014 11:06, Duncan Murdoch wrote:
[...]
I've looked at all SEXPTYPEs in the R internals, and the only one
specific
to integer vectors is INTSXP. Can this be used for vectors of length
larger
than 32-bit?
Yes, see the section on Long Vectors in chapter 12.
('Yes on a 64-bit platform.') The type for a vector length is R_xlen_t,
e.g. allocVector is declared as
SEXP Rf_allocVector(SEXPTYPE, R_xlen_t);
That is never 'long long int'
Oh yes, of course.
I now have all the information I need.
Thanks and best wishes,
Adrian
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Re: [Rd] SEXPTYPEs
On 16/05/2014, 4:16 AM, Adrian Dușa wrote: Dear list, On a follow up from my previous email, I am now trying to allocate vectors of length larger than 32-bit in C. From the R internals documentation, I read that: The sxpinfo header is defined as a 32-bit C structure... and A SEXPREC is a C structure containing the 32-bit header... The question is: does the INTSXP allow vectors larger than 32-bit? A test example: //### int *p_temp; SEXP root = PROTECT(allocVector(VECSXP, 5)); long long int verylargeinteger; // something to compute verylargeinteger, 32-bit SEXP temp = SET_VECTOR_ELT(root, 0, allocVector(INTSXP, verylargeinteger)); p_temp = INTEGER(temp); //### temp should be a vector of length 32-bit, and p_temp should be the pointer to that vector. If declaring: long long int *p_temp; (but the compiler throws a warning with an incompatible pointer type, because pointers should be integers of course). I've looked at all SEXPTYPEs in the R internals, and the only one specific to integer vectors is INTSXP. Can this be used for vectors of length larger than 32-bit? Yes, see the section on Long Vectors in chapter 12. Duncan Murdoch Thank you again, in advance, Adrian __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] SEXPTYPEs
On 16/05/2014 11:06, Duncan Murdoch wrote:
On 16/05/2014, 4:16 AM, Adrian Dușa wrote:
Dear list,
On a follow up from my previous email, I am now trying to allocate
vectors
of length larger than 32-bit in C.
From the R internals documentation, I read that:
The sxpinfo header is defined as a 32-bit C structure...
and
A SEXPREC is a C structure containing the 32-bit header...
The question is: does the INTSXP allow vectors larger than 32-bit?
A test example:
//###
int *p_temp;
SEXP root = PROTECT(allocVector(VECSXP, 5));
long long int verylargeinteger;
// something to compute verylargeinteger, 32-bit
SEXP temp = SET_VECTOR_ELT(root, 0, allocVector(INTSXP,
verylargeinteger));
p_temp = INTEGER(temp);
//###
temp should be a vector of length 32-bit, and p_temp should be the
pointer to that vector.
If declaring:
long long int *p_temp;
(but the compiler throws a warning with an incompatible pointer type,
because pointers should be integers of course).
I've looked at all SEXPTYPEs in the R internals, and the only one
specific
to integer vectors is INTSXP. Can this be used for vectors of length
larger
than 32-bit?
Yes, see the section on Long Vectors in chapter 12.
('Yes on a 64-bit platform.') The type for a vector length is R_xlen_t,
e.g. allocVector is declared as
SEXP Rf_allocVector(SEXPTYPE, R_xlen_t);
That is never 'long long int'
Duncan Murdoch
Thank you again, in advance,
Adrian
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Brian D. Ripley, rip...@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, UKFax: +44 1865 272595
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