# Pi Day

Asked by James Tursa on 14 Mar 2012
Latest activity Commented on by Walter Roberson on 30 May 2012

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?

Aldin on 14 Mar 2012

Here is my solution in MATLAB:

phi = sym('sqrt(2)'); vpa(phi,30000)

Aldin on 14 Mar 2012

Text exceeds maximum line length of 25,000 characters for Command Window display.

Walter Roberson on 14 Mar 2012

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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Answer by Jacob Halbrooks on 14 Mar 2012

Oleg Komarov on 14 Mar 2012

http://i0.kym-cdn.com/entries/icons/original/000/004/029/disgusted-mother-of-god.png

Oleg Komarov on 14 Mar 2012

and http://i2.kym-cdn.com/entries/icons/original/000/002/252/me-gusta.jpg

James Tursa on 14 Mar 2012

OK, on June 28 I will eat a turnover (my suggestion for the food symbol of Tau Day)

Answer by Jan Simon on 15 Mar 2012

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?

David Holdaway on 29 May 2012

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 Simon on 30 May 2012

Ok, then let's look for the genetic implementation of the square function. ;-)

Answer by John D'Errico on 30 May 2012

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

Geoff on 30 May 2012

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 on 30 May 2012

I did 1000 digits when I was in high-school. Just because it was there ;-)