[Octave-bug-tracker] [bug #53299] Several rand/randn bugs with state/seed behavior.

[Dave Goel]

Follow-up Comment #15, bug #53299 (project octave):

>> foo = rand("seed") => Implements K = round(1e20*rand()), implement
rand("state", K), and output K. [or minor variants thereupon.] 


Also wanted to mention: K is actually determiniscally determined from the
current state. So, not only is the state reproducible going forward, it is
also reproducible back in time.

Namely, even if the seed-user tried something really a weird "backwards"-test,
he will still get the right answer: 


K = rand('seed');

rand();

L = rand('seed');


rand('seed' , K)
rand()

Y = rand('seed')


He expects Y=L, and indeed, should find that under the scheme I proposed
above.


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