[Rd] dynamic array output by .C

[Prof Brian Ripley]

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. Thanks

Use lengthgets().

> On 4/14/05, Prof Brian Ripley <ripley at 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 at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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