| % File src/library/datasets/man/randu.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{randu} |
| \docType{data} |
| \alias{randu} |
| \title{Random Numbers from Congruential Generator RANDU} |
| \description{ |
| 400 triples of successive random numbers were taken from the VAX |
| FORTRAN function RANDU running under VMS 1.5. |
| } |
| \usage{randu} |
| \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{ |
| \donttest{## 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} |