pub fn randu() -> Result<DataFrame, PolarsError>Expand description
§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
§Format:
A data frame with 400 observations on 3 variables named ‘x’, ‘y’ and ‘z’ which give the first, second and third random number in the triple.
§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, …, 399), and they are rounded to 6 decimal places.
Under VMS versions 2.0 and higher, this problem has been fixed.
§Source:
David Donoho
§Examples:
## 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))
}