The rand_bytes
function binds to RAND_bytes in
OpenSSL to generate cryptographically strong pseudo-random bytes. See
the OpenSSL documentation for what this means.
[1] 1e 93 90 a8 a6 57 a2 a7 40 34
Bytes are 8 bit and hence can have 2^8 = 256
possible
values.
[1] 30 147 144 168 166 87 162 167 64 52
Each random byte can be decomposed into 8 random bits (booleans)
[1] TRUE TRUE TRUE FALSE TRUE TRUE FALSE TRUE
rand_num
is a simple (2 lines) wrapper to
rand_bytes
to generate random numbers (doubles) between 0
and 1.
[1] 0.2117136 0.1003278 0.6242225 0.4365371 0.3081731 0.9808884 0.1340833
[8] 0.7705363 0.4564735 0.7613557
To map random draws from [0,1] into a probability density, we can use
a Cumulative
Distribution Function. For example we can combine qnorm
and rand_num
to simulate rnorm
:
Same for discrete distributions: