HP Forum Archive 15

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TI-59 vs HP-41 reviving the old contest Message #1 Posted by Vassilis Prevelakis on 28 Oct 2005, 8:16 a.m. 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

Re: TI-59 vs HP-41 reviving the old contest Message #2 Posted by Marcus von Cube, Germany on 28 Oct 2005, 8:28 a.m., in response to message #1 by Vassilis Prevelakis 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

Re: TI-59 vs HP-41 reviving the old contest Message #3 Posted by Gerson W. Barbosa on 29 Oct 2005, 9:54 p.m., in response to message #2 by Marcus von Cube, Germany 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.

Re: TI-59 vs HP-41 reviving the old contest Message #4 Posted by John Limpert on 28 Oct 2005, 8:36 a.m., in response to message #1 by Vassilis Prevelakis See http://www.lacim.uqam.ca/~plouffe/Simon/articlepi.html for an algorithm that allows you to compute individual decimal digits of pi.

Re: TI-59 vs HP-41 reviving the old contest Message #5 Posted by hugh steers on 29 Oct 2005, 10:53 a.m., in response to message #4 by John Limpert 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

Re: TI-59 vs HP-41 reviving the old contest Message #6 Posted by Vassilis Prevelakis on 29 Oct 2005, 8:38 p.m., in response to message #4 by John Limpert 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

Re: TI-59 vs HP-41 reviving the old contest Message #7 Posted by Chris Roccati on 30 Oct 2005, 3:22 p.m., in response to message #6 by Vassilis Prevelakis 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.

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