[R] copying R objects in C
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu May 6 16:51:08 CEST 2004
On Thu, 6 May 2004, Tamas Papp wrote:
> You can tell what a function does by looking at its help page, eg:
>
> ?duplicate
>
> There is no such function in R (1.9.0), so I don't see how you came
> across that function name.
It's a C function (see the subject line), except that the external symbol
name gets remapped to Rf_duplicate. You need this for writing code for
the .Call and similar interfaces.
> R performs a deep copy "on demand", and generally you should not worry
> about this, just use the assignment operator "<-".
Not `from C'.
--
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
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