Many digits of pi again

01272014, 06:44 AM
Post: #1




Many digits of pi again
This is in reference to the article by Katie listing several programs for various machines to calculate many digits of pi in record time, posted Oct 17, 2008
http://www.hpmuseum.org/cgisys/cgiwrap/...i?read=899 Some programs manage 6 digits per memory, some 7 or 8. I suspect the choice is based on a combination of internal precision of calculation and the number of terms calculated. Is there a thread describing how to select the number of digits per memory? Or can someone clarify that? (Katie?) Thank you  sorry if this is a repeat Benoit 

01272014, 07:52 PM
(This post was last modified: 09292014 02:29 PM by Katie Wasserman.)
Post: #2




RE: Many digits of pi again
(01272014 06:44 AM)Benoit Maag Wrote: Some programs manage 6 digits per memory, some 7 or 8. I suspect the choice is based on a combination of internal precision of calculation and the number of terms calculated. Is there a thread describing how to select the number of digits per memory? Or can someone clarify that? (Katie?) Yes, you've got that exactly right. The argument gos something like this: I have a 10digit calculator so I can fit 8 digits into each memory register allowing for multiplication/division of up to 2 digits. So now I can calculate up to 1000 digits. But at XXX digits I need 3 digits in my multiplication/division so I can only use 7 digits per register. You can write a simple formula for this but there are idiosyncrasies of each calculator that need to be taken into consideration and certain programing tricks allow for more (or less) precision, etc.. It's not easy to figure out the maximum number of digits unless you error on the side of caution or do it experimentally. The 16C is a fun calculator to play this game on since it gives you such nice control over the word size. katie 

03222014, 01:34 AM
Post: #3




Verification using Linux
There is the program pi available on Linux systems which calculates π to a specified number of decimal digits.
On a Linux machine connected to the Internet, at a terminal command line enter: Code: sudo aptget install pi Example: Code: $ pi 64 Before installing the program, you might want to update your system. Code: sudo aptget update 

03232014, 12:11 AM
Post: #4




RE: Many digits of pi again
Wow  way cool. Didn't know about the "pi" program.
Brings memories. Me and a friend started a Society for Memorizing and Understanding Universal Constants in high school. The requirement for membership was to recite pi to 52 decimals and e to 34 decimals. And the chairman was the one who at a given time could recite the most decimals of pi. So, when my friend had social sciences, he was sure to be the chair after the class. Whenever I had French, I got out on top. We got to around 350 decimals before we found other fun stuff to do. We never got to be more than three members, though :) 

03232014, 12:20 AM
Post: #5




RE: Many digits of pi again
isn't it pointless to calculate it when it exists other places out more places than you can hope for on a calculator?
http://www.piday.org/million/ On a clear disk, you can seek forever. 

03232014, 12:23 AM
Post: #6




RE: Many digits of pi again
(03232014 12:20 AM)davetheguru Wrote: isn't it pointless to calculate it when it exists other places out more places than you can hope for on a calculator? Oh well... almost everything can be made faster and better than on a calculator. Isn't it? Greetings, Massimo +×÷ ↔ left is right and right is wrong 

03232014, 01:42 PM
Post: #7




RE: Many digits of pi again
(03232014 12:11 AM)Geir Isene Wrote: Wow  way cool. Didn't know about the "pi" program. With internet access, the only program required to get thousands of digits of pi is a web browser. ;) (03232014 12:11 AM)Geir Isene Wrote: The requirement for membership was to recite pi to 52 decimals and e to 34 decimals. 52 and 34? Why that? (03232014 12:11 AM)Geir Isene Wrote: We got to around 350 decimals before we found other fun stuff to do. Ah, those were the days, when memorizing pi was "fun stuff". :)) (03232014 12:11 AM)Geir Isene Wrote: We never got to be more than three members, though :) Fun for a selected audience, that is. ;) Dieter 

03232014, 01:53 PM
Post: #8




RE: Many digits of pi again
(03232014 01:42 PM)Dieter Wrote:(03232014 12:11 AM)Geir Isene Wrote: Wow  way cool. Didn't know about the "pi" program. But the pi program is a) working offline, b) faster, and c) way much cooler. (03232014 01:42 PM)Dieter Wrote:(03232014 12:11 AM)Geir Isene Wrote: The requirement for membership was to recite pi to 52 decimals and e to 34 decimals. Due to the obvious significant of those numbers ;) (actually, I don't remember why) 

02122015, 07:06 PM
Post: #9




RE: Many digits of pi again
the final word on this subject: http://www.smbccomics.com/index.php?id=3639


02122015, 10:59 PM
Post: #10




RE: Many digits of pi again
(02122015 07:06 PM)Den Belillo (Martinez Ca.) Wrote: the final word on this subject: http://www.smbccomics.com/index.php?id=3639 Thanks Den! I know just the people to send this too... we too were a group of guys that tried to outmemorize each other with digits of PI. One of them brought in an article once that showed it could be calculated as an infinite series, and we just poohpoohed him. He will really enjoy this today. Bob Prosperi 

« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)