On Tue, 5 Apr 2011, Bert Freudenberg wrote:
On 05.04.2011, at 02:32, Levente Uzonyi wrote:
On Mon, 4 Apr 2011, michael rice wrote:
I forgot to mention, I'm using the random number tile and scripting. Does that
make it more difficult?
Not really, RandomNumberTile uses the global random number generator of
Collection. I don't know how/why is it serialized/restored
It is not stored in the project. But in trunk, the seed does not get
re-initialized when starting up. In the Etoys image, Collection class has a
startUp method
So it doesn't give the same random numbers after project loading, but
after image startup in Squeak?
startUp
RandomForPicking seed: Time totalSeconds hash asFloat.
IMHO we should adopt something like this for trunk (maybe with your "more"
random approach below).
It can be even better, I just copied (and slightly modified) the code from
UUIDGenerator. Maybe it's the best to move the reseeding code to Random.
Levente
- Bert -
but here's a method which should help:
RandomNumberTile >> #comeFullyUpOnReload: smartRefStream
| seed |
[
seed := (Time millisecondClockValue bitAnd: 16r3FFFFFFF)
bitXor: self hash.
seed := seed bitXor: (Time totalSeconds bitAnd: 16r3FFFFFFF).
seed := seed bitXor: 16r3FFFFFFF atRandom.
seed = 0 ] whileTrue. "Try again if ever get a seed = 0"
Collection mutexForPicking critical: [
Collection randomForPicking seed: seed ].
^super comeFullyUpOnReload: smartRefStream
It's drawback is that it will reseed the rng for every RandomNumberTile. The
best solution would be if Etoys would use a custom Random instance or a
subclass where this is done by default.
Levente
Michael
--- On Mon, 4/4/11, Levente Uzonyi <le...@elte.hu> wrote:
From: Levente Uzonyi <le...@elte.hu>
Subject: Re: [Newbies] Randomness
To: "A friendly place to get answers to even the most basic questions about Squeak."
<beginners@lists.squeakfoundation.org>
Date: Monday, April 4, 2011, 8:08 PM
On Mon, 4 Apr 2011, michael rice wrote:
I just noticed that when I load a morphic project I get the same stream of
random numbers each time. Is there a simple way to install a new different
random seed each time the project is loaded?
If you serialize the Random object, then it will have the same state when it's
restored. I guess you should create a subclass of Random, which implements
#comeFullyUpOnReload:. That method can reinitialize the seed of the random number
generator. You may want to check UUIDGenerator >> #makeSeed if you don't know
how to get a good seed for your rng.
Levente
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