On 6/29/07, Ryan A <[EMAIL PROTECTED]> wrote:
Hey,
Have a quick question about which is better to get real random values, shuffle
or mt_rand.
I am trying to shuffle a deck of cards and reading another thread I saw that
after a couple of thousand random generations patterns have been observed using
rand()... so its better to use mt_rand().
After i wrote a function (copied below) to get real random cards from a 52
deck, Tijnema from the list kindly sent me a piece of code thats
simpler/faster/should or would use less processing and does exactly what my
function does except it uses shuffle()...
Any idea which would be better to constantly generate proper random numbers for
a long period of time?
<code>
Any comments and suggestions are also welcome.
Thanks!
Ryan
Just did a quick benchmark for 10.000 hands (making a full deck on
your code, 23.5 players):
Microtime difference:
Ryan's code:15.725826978683
Tijnema's code:0.40006709098816
Unique decks out of 10000:
Ryan's code:10000
Tijnema's code:10000
When making a full deck my code is 40 times faster, and a lot less
memory intensive. And as you can see, for both all 10000 decks are
unique, so both are random :)
But, also when generating cards for only 4 players, my code is twice
as fast as yours, and both generate still 10000 random decks:
Microtime difference:
Ryan's code:0.82403707504272
Tijnema's code:0.40426802635193
Unique decks out of 10000:
Ryan's code:10000
Tijnema's code:10000
Tijnema
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