From: Dirk Eddelbuettel <edd_at_debian.org>

Date: Thu, 28 Jan 2010 11:23:47 -0600

Date: Thu, 28 Jan 2010 11:23:47 -0600

On 28 January 2010 at 17:59, Guillaume Yziquel wrote:

| Guillaume Yziquel a écrit :

*| > Dirk Eddelbuettel a écrit :
**| >>
**| >> Salut Guilluame,
**| >>
**| >> | > val norm_rand : unit -> float
**| >> | > Random variates from the standard normal distribution. Bug:
**| >> currently systematically returns -8.77332116900134373.
**| >> | | Any idea as to why the function systematically returns the same
**| >> value? | Is there a way the math library should be initialised?
**| >>
**| >> I think it is pretty clearly documented in R-exts:
**| >>
**| >> However, before these are used, the user must call
**| >> GetRNGstate();
**| >> and after all the required variates have been generated, call
**| >> PutRNGstate();
**| >> These essentially read in (or create) `.Random.seed' and write it out
**| >> after use.
**| >
**| > Fair enough. I admit I've been busy with low detail stuff, and omitted
**| > to come back to R-exts.
**| >
**| > However, I have another question on which I do not find information (I
**| > found it once, but do not know how to find it again...): What's the big
**| > difference between using the R mathematical library in standalone mode
**| > and not in standalone mode? How does it translate in terms of C
**| > directives and linking modalities? I've noticed the MATHLIB_STANDALONE
**| > macro, but I do not know how I should use it...
**| >
**| > All the best,
**|
**| OK. So concerning the headers:
**|
**| #define MATHLIB_STANDALONE
**| #include <Rmath.h>
**|
**| Concerning dependencies: compile against only libRmath.so. Not against
**| libR.so. (I wonder why this is so crucial, though...)
*

By design as libRmath is meanth to __standalone__ hence indepdent of R. This is a a feature.

This is probably not what _you_ want as you are embedding R, so you need libR.

| Concerning documentation: Section 9 The standalone Rmath library from

*| the R-admin.pdf documentation.
**|
**| This solved my problem, since I'm able to generated random values with
**| norm_rand, unif_rand, etc...
**|
**| Thank you for your help.
*

Always a pleasure.

Dirk

-- Three out of two people have difficulties with fractions. ______________________________________________ R-devel_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-develReceived on Thu 28 Jan 2010 - 17:27:25 GMT

Archive maintained by Robert King, hosted by
the discipline of
statistics at the
University of Newcastle,
Australia.

Archive generated by hypermail 2.2.0, at Thu 28 Jan 2010 - 18:00:17 GMT.

*
Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-devel.
Please read the posting
guide before posting to the list.
*