\name{snowFT-rand}
\title{Random Number Generation}
\alias{clusterSetupRNG.FT}
\alias{clusterSetupRNGstreamRepli}
\usage{
clusterSetupRNG.FT (cl, type = "RNGstream", streamper="replicate", ...)
clusterSetupRNGstreamRepli (cl, seed=rep(12345,6), n, ...)
}
\arguments{
  \item{cl}{Cluster object.}
  \item{type}{\code{type="RNGstream"} (default) initializes the
    L'Ecuyer's RNG.  \code{type="SPRNG"} initializes the
    SPRNG generator.}
  \item{streamper}{\code{streamper="node"} initializes one random
    number stream per node.\cr \code{streamper="replicate"} (default) initializes one stream per replicate.}
  \item{...}{Arguments passed to the underlying function (see details
bellow).} 
  \item{seed}{Integer value (SPRNG) or a vector of six integer values
    (RNGstream) used as seed
    for the RNG.}
  \item{n}{Number of streams to be created. It should correspond to
    the number of replicates in the computation.}
}
\description{
  Initialize independent random number streams to be used in the
  cluster. It uses either the L'Ecuyer's random number generator
  (package rlecuyer required) or the SPRNG generator (package rsprng required). 
}
\details{
  \code{clusterSetupRNG.FT} calls (subject to its argument values) one of
  the following functions, passing arguments \code{(cl, ...)}: If the
"SPRNG" type is used, then in case of
  \code{streamper="node"} the snow function \code{clusterSetupSPRNG} is
  called. In case of \code{streamper="replicate"}, the function only checks
  the availability of the \code{rsprng} package on nodes but no initialization will be done at this point. 
  If the
  "RNGstream" type is used, then in case of
  \code{streamper="node"} the snow function \code{clusterSetupRNGstream} is
  called and in case of
  \code{streamper="replicate"} the function
  \code{clusterSetupRNGstreamRepli} is called. In the latter case, the
  argument \code{n} has to be given that corresponds to the total number
  of streams created for the computation. This mode is used by \code{\link{clusterApplyFT}}. 
 Note that using the function
  \code{performParalell}, 
  the user does not need to initialize the RNG separately, since it is
  accomplished within the function. 

  \code{clusterSetupRNGstreamRepli} loads the \code{rlecuyer} package
  and on each node it creates \code{n} streams. The
  streams are named by their ordinal number. 
}
\examples{
  \dontrun{
cl <- makeClusterFT(3)
r<-10
clusterSetupRNG.FT(cl, streamper="replicate",n=r, seed=rep(1,6))
res<-clusterApplyFT(cl,rep(5,10),rnorm)
stopCluster(res[[2]])
print(res[[1]])
  }
}
\keyword{programming}