[Rcpp-devel] Setting the R random seed from Rcpp

[Simon Zehnder]

Hi Matteo,

I do not know what you really want to do, but if you want to replicate results, you could do the following in Rcpp before running the RNG:

Rcpp::Environment baseEnv("package:base");
Rcpp::Function setSeed = baseEnv["set.seed"];
setSeed(0);    //any other number would do it here


Best
Simon


On Jun 7, 2013, at 4:22 PM, Matteo Fasiolo <matteo.fasiolo at gmail.com> wrote:

> Dear Rcpp experts,
> 
>  I would like to be able to store the R random seed from a Rcpp
> function and then reset it. In other words I would like to replicate
> the following code in Rcpp:
> 
> savedSeed <- .Random.seed
> x <- Rfunction(parameters1);
>       
> .Random.seed <- savedSeed
> x1 <- Rfunction(parameters2); 
> 
> where Rfunction simulates some random numbers and uses them
> but with different parameter values.
> Is it possible to do something similar in Rcpp?
> Probably using GetRNGstate() and PutRNGstate()?
> 
> Thanks,
> 
> Matteo
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