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Talk:Card shuffles: Difference between revisions
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== task needs more definition ==
Task needs more definition so we can know whether an implementation is suitable or not. --[[User:Rdm|Rdm]] ([[User talk:Rdm|talk]]) 04:31, 28 April 2015 (UTC)
:It's a draft so OK. What do you want to see? --[[User:Mwn3d|Mwn3d]] ([[User talk:Mwn3d|talk]]) 16:21, 28 April 2015 (UTC)
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The Rosetta Code task's preamble essentially mentions a perfect riffle shuffle, taking one card from a halved pile, effectively interleaving the 1st card from one pile with the 1st card from the other pile (or the last card ...), and so on with the 2nd two cards, etc. Almost all riffles (in real life) are interleaved in bunches, where a bunch of cards could be one, two, or three, or more, if the cards are well used, and there isn't a good edge for the shuffler's fingers. Using a one, two, or three card
riffle shuffle would be very "real world". Even my mechanical riffle shuffler has a randomizer built-in (caused by unevenness in the playing cards), with the advantage that it doesn't apply hand oils. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 06:01, 29 August 2018 (UTC)
:There are still 2 possibilities. After the perfect split you can perform a perfect riffle such that the previous top card is still on top or is now second. It is well known that if you keep the top card on top each time the deck returns to its original state after 8 iterations.--[[User:Nigel Galloway|Nigel Galloway]] ([[User talk:Nigel Galloway|talk]]) 13:50, 29 August 2018 (UTC)
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