The R Project SVN R

\name{randu}
\alias{randu}
\title{Random Numbers from Congruential Generator}
\usage{data(randu)}
\description{
    400 triples of successive random numbers were taken from the VAX
    FORTRAN function RANDU running under VMS 1.5.
}
\details{
    In three dimensional displays it is evident that the triples fall on
    15 parallel planes in 3-space. This can be shown theoretically to be
    true for all triples from the RANDU generator.

    These particular 400 triples start 5 apart in the sequence, that is
    they are ((U[5i+1], U[5i+2], U[5i+3]), i= 0, \dots, 399), and they
    are rounded to 6 decimal places.

    Under VMS versions 2.0 and higher, this problem has been fixed.
}
\format{
    A data frame with 400 observations on 3 variables named \code{x},
    \code{y} and \code{z} which give the first, second and third random
    number in the triple.
}
\source{
    David Donoho
}
\examples{
\dontrun{## We could re-generate the dataset by the following R code
seed <- as.double(1)
RANDU <- function() {
    seed <<- ((2^16 + 3) * seed) %% (2^31)
    seed/(2^31)
}
for(i in 1:400) {
    U <- c(RANDU(), RANDU(), RANDU(), RANDU(), RANDU())
    print(round(U[1:3], 6))
}}
}
\keyword{datasets}