Pi Day

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James Tursa
James Tursa 2012-3-14
In recognition of Pi Day (3/14 using MM/DD format), I suggest everyone eat a slice of pie today, and while you are eating it download at least one of the following FEX submissions to play with:
http://www.mathworks.com/matlabcentral/fileexchange/29504-the-computation-of-pi-by-archimedes
http://www.mathworks.com/matlabcentral/fileexchange/19265-calculate-pi-decimals
http://www.mathworks.com/matlabcentral/fileexchange/32178-cleves-corner-computing-pi
Did I miss any other good ones?
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Aldin
Aldin 2012-3-14
Text exceeds maximum line length of 25,000 characters for Command Window display.
Walter Roberson
Walter Roberson 2012-3-14
On Sunday I pointed out to someone that it was Pi in the afternoon (the clock showed 3:14). Alas, it took them time to get a-round to understanding me.

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Jacob Halbrooks
Jacob Halbrooks 2012-3-14
The correct answer is Tau.
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Oleg Komarov
Oleg Komarov 2012-3-14
and http://i2.kym-cdn.com/entries/icons/original/000/002/252/me-gusta.jpg
James Tursa
James Tursa 2012-3-14
OK, on June 28 I will eat a turnover (my suggestion for the food symbol of Tau Day)

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更多回答（2 个）

Jan
Jan 2012-3-15
The human pupil has a circular shape. Therefore the instructions to create it must contain the value of Pi. After the recent outcomes of the full genome sequencing projects, it must be possible to find the genetic representation of Pi. Beside the scientific import of this, it would allow to measure the numerical precision of the genetic code.
Is such a study published already?
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David Holdaway
David Holdaway 2012-5-29
Lots of spherical things occur in nature but don't contain the value Pi in any way. If lots of things rub together they tend to erode to spherical shapes, circles and spheres tend to form for a large number of similar reasons to do with how they are stretched.
If I have any damped system has a potential energy is minimized by being a certain euclidean distance from a point then the resulting stable solution is that it satisfies x^2+y^2 + (z^2 + however many dimension) = distance. This does not contain Pi in any way but still produces a circle / sphere. It seems very unlikely that Pi is encoded into genetics in any meaningful way.
Jan
Jan 2012-5-30
Ok, then let's look for the genetic implementation of the square function. ;-)

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John D'Errico
John D'Errico 2012-5-30
Well, you could always use HPF...
http://www.mathworks.com/matlabcentral/fileexchange/36534-hpf-a-big-decimal-class-currently-in-beta-release
I've included a half million digits or so of pi with that tool, or you can use it compute as many as you like. In fact, I used hpf to compute those 500,000 digits themselves.
>> pie = hpf('pi',1000) pie = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609433057270365759591953092186117381932611793105118548074462379962749567351885752724891227938183011949129833673362440656643086021394946395224737190702179860943702770539217176293176752384674818467669405132000568127145263560827785771342757789609173637178721468440901224953430146549585371050792279689258923542019956112129021960864034418159813629774771309960518707211349999998372978049951059731732816096318595024459455346908302642522308253344685035261931188171010003137838752886587533208381420617177669147303598253490428755468731159562863882353787593751957781857780532171226806613001927876611195909216420199
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Geoff
Geoff 2012-5-30
Now... memorise them and join the elite crowd of people-who-have-nothing-better-to-do... http://pi-world-ranking-list.com/index.php?page=lists&category=pi&sort=digits
I still think Tau is more natural.
Walter Roberson
Walter Roberson 2012-5-30
I did 1000 digits when I was in high-school. Just because it was there ;-)

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