Pi - Page 2 - Tilted Forum Project Discussion Community

Caphreak · 07-29-2003, 04:54 PM

Im not sure how to calculate it exactly, but i remember doing a program for high school Visual Basic that could calculate pi to 500,000 digits... computers can do it as 4.0 * arctan(1.0) but i have no idea what arctan is

wlcm · 07-29-2003, 11:11 PM

arctan is the inverse function of tangent.

like how tan(pi/4) = 1, acrtan(1) = pi/4.

Stiltzkin · 07-30-2003, 01:03 PM

I once downloaded a text file containing pi to around 6-billion digits. I also once made the mistake of opening this text file. Took about 15 minutes to load it into memory

This is awesome, an actual algorithm for finding pi

Quote:

1. Initial value setting;
a = 1 b = 1 / SqRt(2) t = 1/4 x = 1

2. Repeat the following statements until the difference of a and b is within the desired accuracy;
y = a
a = (a+b) / 2
b = SqRt(b*y)
t = t - x * (y-a)^2
x = 2 * x

3. Pi is approximated with a, b and t as;
Pi = ((a+b)^2) / (4*t)

Link

If I had the desire to, I'd toss this into my C compiler right now and run it, but nah...

Apparently the record is 206,158,430,000 accurate digits of pi, held by Y. Kanada and D. Takahashi. Figures they'd be Japanese

If you want to see pi to 206,158,430,000 digits really bad, go here and help yourself. It's pretty damn slow, though. I estimate the total size to be around:

201326592 Kb, which would be...
196608 Mb, which would be...
192 Gb

Who the hell wants to fill up a really, really expensive hard drive with nothing but pi?

hobo · 07-30-2003, 08:52 PM

i memorized part of Pi one day out of boredom

3.141592653

now I have memorized more

3.14159265358979323

Thanks guys!

TheJeff · 08-03-2003, 03:41 PM

I saw a video clip of a guy who had memorized it to several thousand places. You could read him a series of numbers from any spot, and he could continue from that point on (much like hearing a beat or lyrics from a song).

-Jeff

08-03-2003, 03:41 PM	#45 (permalink)
TheJeff Upright Location: College Park	I saw a video clip of a guy who had memorized it to several thousand places. You could read him a series of numbers from any spot, and he could continue from that point on (much like hearing a beat or lyrics from a song). -Jeff __________________ Mindless fools that aggravate it Pick at you in desperation

07-29-2003, 04:54 PM	#41 (permalink)
Caphreak Insane Location: Ames, IA	Im not sure how to calculate it exactly, but i remember doing a program for high school Visual Basic that could calculate pi to 500,000 digits... computers can do it as 4.0 * arctan(1.0) but i have no idea what arctan is

07-29-2003, 11:11 PM	#42 (permalink)
wlcm Tilted Location: Austin, TX	arctan is the inverse function of tangent. like how tan(pi/4) = 1, acrtan(1) = pi/4.

07-30-2003, 08:52 PM	#44 (permalink)
hobo Archangel of Change	i memorized part of Pi one day out of boredom 3.141592653 now I have memorized more 3.14159265358979323 Thanks guys!