[R] Load the shared object/DLL
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Apr 16 12:55:13 CEST 2008
On Wed, 16 Apr 2008, Guohui Ding wrote:
> Dear All,
> I have written a function in c (in a file named 'a.c') as follows,
*PLEASE* don't claim credit for the work of others (in this case it is me
that you owe the apology and retraction to). That is from 'S Programming'
p. 126, and 'Writing R Extensions'.
> void convolve(double *a, int *na, double *b, int *nb, double *ab)
> int i, j, nab = *na + *nb - 1;
> for(i = 0; i < nab; i++)
> ab[i] = 0.0;
> for(i = 0; i < *na; i++)
> for(j = 0; j < *nb; j++)
> ab[i + j] += a[i] * b[j];
> Then, I created a shared file in the Windows,
> R CMD SHLIB -d -o a.dll a.c
> Every thing is OK now.
> I changed the working directory of the R environment to the directory
> containing the a.dll.
> I enter two commands in the R console,
>  FALSE
> The question is that, why was the "a.dll" failed to be loaded in the R
> enviroment? Which step resuted in this problem?
It did not fail. is.loaded("a") looks for entry point "a", and you have
> Any suggestion was welcome.
Do note that posting guide said about where to post non-R programming
> G. Ding
> [[alternative HTML version deleted]]
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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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