[Blackjack] Shuffling

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January 27th, 2004, 10:09 AM

Anonymous

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[Blackjack] Shuffling

The shuffling of the decks will be shuffled randomly or it will simulate some specific shuffling method (in the final version of the blackjacklib.php)?
For example:

Quote:

A common shuffle used by casinos is the "zone Shuffle". Here, the cards are broken into piles, and then the shuffling is only performed between the piles.

January 27th, 2004, 02:13 PM

xs0

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[Blackjack] RE: Shuffling

The cards will be shuffled randomly as in the testing lib (i.e. the whole deck will be shuffled together, but not necessarily with shuffle()).

Does it matter?

January 28th, 2004, 07:11 AM

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[Blackjack] RE: Shuffling

Thanks.

January 28th, 2004, 07:17 AM

Anonymous

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[Blackjack] RE: Shuffling

There are probability theories depending on the shuffling methods. For example see Knuth: The art of computer programming. Vol 2. pg p145-148.
He explains for a certain shuffling method that not all the permutation of the cards will occure.

January 28th, 2004, 07:21 AM

xs0

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[Blackjack] RE: Shuffling

Well, what I have in mind is:

php Code:

Original - php Code
$input=array(1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,... ); $output=array(); $size=sizeof($input); $last=$size-1; while (sizeof($output)<$size) { do { $which=mt_rand(0, $last); } while ($input[$which]==-1); $output[]=$input[$which]; $input[$which]=-1; }

 
$input=array(1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,...  );
$output=array();
$size=sizeof($input);
$last=$size-1;
 
while (sizeof($output)<$size) {
    do {
        $which=mt_rand(0, $last);
    } while ($input[$which]==-1);
    $output[]=$input[$which];
    $input[$which]=-1;
}

It's slow, but very random

January 28th, 2004, 08:06 AM

Anonymous

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[Blackjack] RE: Shuffling

The cards will be random, and practically any of the permutations could appear.
This means that no shuffling prediction algoritm should be used.
Thanks for the info.

January 28th, 2004, 09:29 AM

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[Blackjack] RE: Shuffling

But will you use the same shuffled deck for everyone ?
Or everyone will get a different one?

January 28th, 2004, 09:35 AM

xs0

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[Blackjack] RE: Shuffling

Yup, as the rules say, every script will get exactly the same conditions.

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