Posts: 669
Threads: 63
Joined: Dec 2009
Back in 1982, there were a number of attempts to pit the TI-59 against the HP-41. In the PCC Journal V9 N5 (Aug 1982), p 25 there was an article called "LOTS OF PIE" which included a program for calculating the digits of pi on the TI-59.
Another contest involved calendar printing and (I think) another the calculation of digits of e.
Both e and pi calculations were limited by available registers, because all digits of the number were retained. However, since both the TI-59 and (of course) the HP-41 have output devices, how about a new contest to calculate e or pi by printing the digits calculated on the printer as they are computed.
Any takers?
**vp
Posts: 3,283
Threads: 104
Joined: Jul 2005
Hi Vassilis,
do you have alogrithms for PI and e handy?
The TI line of programmables (56 and 59) were the first programmable devices I've ever owned. I might be interested in such a challenge.
Marcus
Posts: 172
Threads: 13
Joined: Jul 2005
See http://www.lacim.uqam.ca/~plouffe/Simon/articlepi.html for an algorithm that allows you to compute individual decimal digits of pi.
Posts: 536
Threads: 56
Joined: Jul 2005
i tried to port that algorithm to the 41, but its too slow. theoretically, you can continue to calculate pi forever, but in practice it quickly get to a 3-day wait for digits still below 1000.
feel free to improve my program!
http://www.voidware.com/index.php?option=com_wrapper&page=http://www.voidware.com/calcs/hp41cv.htm
Posts: 669
Threads: 63
Joined: Dec 2009
Oh, yes, Simon Plouffe is one of the team!
If you look at this picture (presumably from his desk:
http://www.lacim.uqam.ca/%7Eplouffe/prix.jpg),
you will notice in the right bottom corner an HP calculator (32SII ???).
**vp
Posts: 2,761
Threads: 100
Joined: Jul 2005
Hi Marcus,
Take a look at this algorithm (Brent-Salamin):
http://mathforum.org/library/drmath/view/58283.html
I tested it on both the 48GX and 49G and it worked great. Of course I used the long float libraries available for these calculators to make the job easier (only a few lines using those libraries). It would have been more interesting the implementation of the required long float operators in RPL though. (Besides '+', '-', '*' and '/' it would be required long float square root).
Regards,
Gerson.
Posts: 64
Threads: 4
Joined: Jan 1970
The calculator in the image is an HP-32SII:
the keys in the leftmost column are (unreadable), (unreadable/likely STO), ENTER, XEQ, gold left arrow and a bit of the blue right arrow.
