Greetings, I am building a stochastic simulation model in a C++ shared library for R. My model will generate a random number of new observations and also delete some old observations, however, the numbers cannot be predicted before the computation engine runs. For simplicity, I am trying to control my programming at the second stage (pure C++ for R). It seems .C accepts fixed size of arrays as input (also ouput), can I modify size of array for deleting old and adding new observations in .C? Thanks in advance. -- I am Tib, not Rob.
On Thu, 14 Apr 2005, Tib wrote:> Greetings, > > I am building a stochastic simulation model in a C++ shared library > for R. My model will generate a random number of new observations and > also delete some old observations, however, the numbers cannot be > predicted before the computation engine runs. For simplicity, I am > trying to control my programming at the second stage (pure C++ for R). > It seems .C accepts fixed size of arrays as input (also ouput), can I > modify size of array for deleting old and adding new observations in > .C?No, but .Call can. -- Brian D. Ripley, ripley@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
HI, from the examples of Writing R Extensions, I see one still has to declare the size of arrays by NEW_NUMERIC(n) or allocVector(REALSXP,n), how can I extend arrays? I know this question is a little specific, but it would be a lot helpful if anyone can give me a quick question. Thanks On 4/14/05, Prof Brian Ripley <ripley@stats.ox.ac.uk> wrote:> On Thu, 14 Apr 2005, Tib wrote: > > > Greetings, > > > > I am building a stochastic simulation model in a C++ shared library > > for R. My model will generate a random number of new observations and > > also delete some old observations, however, the numbers cannot be > > predicted before the computation engine runs. For simplicity, I am > > trying to control my programming at the second stage (pure C++ for R). > > It seems .C accepts fixed size of arrays as input (also ouput), can I > > modify size of array for deleting old and adding new observations in > > .C? > > No, but .Call can. > > -- > Brian D. Ripley, ripley@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 >-- I am Tib, not Rob.
On Thu, 14 Apr 2005, Tib wrote:> from the examples of Writing R Extensions, I see one still has to > declare the size of arrays by NEW_NUMERIC(n) or > allocVector(REALSXP,n), how can I extend arrays? > > I know this question is a little specific, but it would be a lot > helpful if anyone can give me a quick question. ThanksUse lengthgets().> On 4/14/05, Prof Brian Ripley <ripley@stats.ox.ac.uk> wrote: >> On Thu, 14 Apr 2005, Tib wrote: >> >>> Greetings, >>> >>> I am building a stochastic simulation model in a C++ shared library >>> for R. My model will generate a random number of new observations and >>> also delete some old observations, however, the numbers cannot be >>> predicted before the computation engine runs. For simplicity, I am >>> trying to control my programming at the second stage (pure C++ for R). >>> It seems .C accepts fixed size of arrays as input (also ouput), can I >>> modify size of array for deleting old and adding new observations in >>> .C? >> >> No, but .Call can.-- Brian D. Ripley, ripley@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