Re: [Rd] Problem with R math library.

From: Guillaume Yziquel <guillaume.yziquel_at_citycable.ch>
Date: Thu, 28 Jan 2010 14:00:02 +0100

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,

-- 
      Guillaume Yziquel
http://yziquel.homelinux.org/

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Received on Thu 28 Jan 2010 - 13:03:27 GMT

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