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The Magic Cafe Forum Index » » Not very magical, still... » » And how many times should you shuffle a deck of cards? (0 Likes) Printer Friendly Version

daffydoug
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Fear not! Modern science has found the answer!

http://www.dartmouth.edu/~chance/course/......ber.html
The difficult must become easy, the easy beautiful and the beautiful magical.
EsnRedshirt
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Seven. I thought this was common knowledge.

Should I read the article? Oh, I was right!
(Nice section at the end, titled "Grist for Magicians". Though personally (if I actually did card tricks in the first place), I'd rather substitute a second, non-shuffled deck after letting an audience member shuffle and cut it.)
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* = Take any advice from this person with a grain of salt.
balducci
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Quote:
On 2009-06-26 14:07, daffydoug wrote:
Fear not! Modern science has found the answer!

http://www.dartmouth.edu/~chance/course/......ber.html

That's an OLD article. I thought everyone (card people) would know about that by now.

Diaconis has done much more recent work on flipping coins. I think there is a thread about it on here, somewhere.
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Cliffg37
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Believe it or not, the "7" factoid actually appears in textbooks. I mean Algebra 1 textbooks. I was shocked to see it there, but any self working card trick is probably dependent on some math somewhere.
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Magnus Eisengrim
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Quote:
On 2009-06-26 15:01, balducci wrote:
Quote:
On 2009-06-26 14:07, daffydoug wrote:
Fear not! Modern science has found the answer!

http://www.dartmouth.edu/~chance/course/......ber.html

That's an OLD article. I thought everyone (card people) would know about that by now.

Diaconis has done much more recent work on flipping coins. I think there is a thread about it on here, somewhere.


Hey there youngster, 1990 was not that long.........oh, I guess it was. Sheesh.

John
The blood-dimmed tide is loosed, and everywhere
The ceremony of innocence is drowned;
The best lack all conviction, while the worst
Are full of passionate intensity.--Yeats
daffydoug
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Hey guys I didn't know!
The difficult must become easy, the easy beautiful and the beautiful magical.
kcg5
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At any card table, seven times is over the top. better stick with the RRSR sequence. its good enough for the world series.
Nobody expects the spanish inquisition!!!!!



"History will be kind to me, as I intend to write it"- Sir Winston Churchill
ringmaster
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Seven perfect Faros.
Less than 2% of reported UFO's turn out to be actual interplanetary vehicles.
kcg5
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Seven perfect faros gets them one away from new deck order. it should be a normal shuffle, in theory, with 7 shuffles. normal meaning uneven.
Nobody expects the spanish inquisition!!!!!



"History will be kind to me, as I intend to write it"- Sir Winston Churchill
Magnus Eisengrim
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Quote:
On 2009-06-27 22:17, kcg5 wrote:
Seven perfect faros gets them one away from new deck order. it should be a normal shuffle, in theory, with 7 shuffles. normal meaning uneven.


I'm not sure what you mean by that. It seems to me that after 7 faroes, the deck is as random as it is after one faro--that is it's one operation away from new deck order.

John
The blood-dimmed tide is loosed, and everywhere
The ceremony of innocence is drowned;
The best lack all conviction, while the worst
Are full of passionate intensity.--Yeats
MagicSanta
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The deck is never random if doing faros, from new deck order every card will be in a precise location after every shuffle and at eight be back in new deck order to start again.
stoneunhinged
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You guys are exposing. I'm telling.
Voldemort
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Quote:
On 2009-06-27 22:17, kcg5 wrote:
Seven perfect faros gets them one away from new deck order. it should be a normal shuffle, in theory, with 7 shuffles. normal meaning uneven.


7 perfect OUT faros that is. And if you START in new deck order. The faro won't bring you order from chaos. Maybe it would in 7,000,000 or so. But I'm not about to try it.

And I thought the faro was a normal shuffle.

Magicsanta, The faro will always yeild ramdom results unless the positions of the cards are known. New deck order works as such and so does any full or partial stack. For example, if the two jokers start in 6th and 13th position and one in faro is applied, the result will be that the jokers now lay in positions 12 and 26 and so on.

I'm sure you know this, I just wanted to add something because I'm bored. Smile

V.
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Jordini
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Lennart Green talk about this idea a lot in his card magic.
kcg5
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John, I only meant that in terms of shuffling 7 times to get perfect randomness, a faro isn't really needed.

In terms of time, I still think the RRSR sequence is best
Nobody expects the spanish inquisition!!!!!



"History will be kind to me, as I intend to write it"- Sir Winston Churchill
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