integer64: random numbers
Create uniform random 64-bit integers within defined range
runif64(n, min = lim.integer64()[1], max = lim.integer64()[2], replace=TRUE)
n |
length of return vector |
min |
lower inclusive bound for random numbers |
max |
upper inclusive bound for random numbers |
replace |
set to FALSE for sampleing from a finite pool, see |
For each random integer we call R's internal C interface unif_rand() twice.
Each call is mapped to 2^32 unsigned integers. The two 32-bit patterns are concatenated
to form the new integer64. This process is repeated until the result is not a NA_INTEGER64.
a integer64 vector
Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>
runif64(12) runif64(12, -16, 16) runif64(12, 0, as.integer64(2^60)-1) # not 2^60-1 ! var(runif(1e4)) var(as.double(runif64(1e4, 0, 2^40))/2^40) # ~ = 1/12 = .08333 table(sample(16, replace=FALSE)) table(runif64(16, 1, 16, replace=FALSE)) table(sample(16, replace=TRUE)) table(runif64(16, 1, 16, replace=TRUE))
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