HP Forum Archive 13

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Looking for HP Journal article Message #1 Posted by james (UK) on 13 Nov 2003, 8:40 a.m. Hi y'all Anyone know if W Kahan's paper "Personal Calculator has Key to Solve Any Equation f(x) = 0" which appeared in the HP Journal 30 #12 (Dec 1979) pp20-26 (and deals with the 34C) is available on the 'net? Extract from his paper "Mathematics Written in Sand": "Euphoric at the sucess of the HP-38E, Dennis Harms' manager, Stan Mintz, humoured us by granting permission to devise a calculator with a [SOLVE] key, despite that no marketing survey had revealed any demand for such a thing, and subject to one proviso: mindful of his struggles with integrals in college, he charged us to devise an [INTEGRATE] key too. Thus was the HP-34C born."

Re: Looking for HP Journal article Message #2 Posted by Valentin Albillo on 13 Nov 2003, 11:35 a.m., in response to message #1 by james (UK) Hi, james (UK): james (UK) posted: "Anyone know if W Kahan's paper "Personal Calculator has Key to Solve Any Equation f(x) = 0" which appeared in the HP Journal 30 #12 (Dec 1979) pp20-26 (and deals with the 34C) is available on the 'net?" Yes. Best regards from V.

But buy the MoHPC set anyway... Message #3 Posted by Karl Schneider on 14 Nov 2003, 2:04 a.m., in response to message #2 by Valentin Albillo ... if I remember correctly, the MoHPC scans of these articles are higher-resolution than the ones available from Cal-Berkeley.

D'oh............ Message #4 Posted by james (UK) on 14 Nov 2003, 2:13 p.m., in response to message #3 by Karl Schneider Can't see what's in front of me - had another look at my MoHPC CDs and it's there as plain as can be.....

Re: Looking for HP Journal article Message #5 Posted by Massimo Gnerucci (Italy) on 13 Nov 2003, 12:34 p.m., in response to message #1 by james (UK) Yes, it is! I can only give you an hint: I cannot write here where it is. Greetings, Massimo

...not a useful hint now... Message #6 Posted by Massimo on 13 Nov 2003, 12:39 p.m., in response to message #5 by Massimo Gnerucci (Italy) ...since Valentin replied with a neutral and valid link. His reply wasn't there when I began mine: strange how TimeZones work :-) Greetings, Massimo

Re: Looking for HP Journal article Message #7 Posted by Holger Veit (DE) on 14 Nov 2003, 3:38 a.m., in response to message #5 by Massimo Gnerucci (Italy) You wrote: >I can only give you an hint: I cannot write here where it is. It is obvious which site is meant here. What I would like to know though is the reason for this ban from this site. Looks to me not like normal competition (infact: there are also documentation CDs sold), but more. What's on and how can we avoid this obvious split of community? Holger

Re: Looking for HP Journal article Message #8 Posted by Giuseppe Marullo on 15 Nov 2003, 7:25 a.m., in response to message #5 by Massimo Gnerucci (Italy) Massimo, could you please contact me at giuseppe.marullo@iname.com ? Grazie, Giuseppe Marullo

Re: Looking for HP Journal article Message #9 Posted by Massimo on 15 Nov 2003, 12:18 p.m., in response to message #8 by Giuseppe Marullo You have new mail! :) Ciao, Massimo

Many thanks Message #10 Posted by james (uk) on 13 Nov 2003, 2:14 p.m., in response to message #1 by james (UK) Hi Valentin and Massimo Muchas gracias and molti grazia (I hope thats right!) for the bed-time reading. Best James

Re: Many thanks Message #11 Posted by Patrick on 13 Nov 2003, 4:02 p.m., in response to message #10 by james (uk) Hi James I am in the midst of writing an article about HP Solve. Take a look at this thread for background. I'm hoping that HPCC Journal will accept it. I would appreciate any insights you might get in reading Dr. Kahan's wonderful articles. Regards, Patrick

Re: Many thanks Message #12 Posted by Namir Shammas on 13 Nov 2003, 8:41 p.m., in response to message #11 by Patrick I am testing a comprehensive algorithm that solves the root of an equation using an enhanced version of Newton's method. The algoritthm I am working on handles the cases were basic Newton will fail: 1. The guess is near a maximum or minimum point. 2. The function looks like a strechted S with two somwhat parallel extremes (a variant of tanh(x) for example). In this case, the guess cycles back and forth. I am using Excel's VBA to test the algorithm (you can alway store intermeidate values in the spreadsheet). I feel that to solve case 2 I need to use the basic Bisection method to ensure convergence and move away from relying on slopes (which got us into trouble in the first place). Namir

Re: Many thanks Message #13 Posted by james (UK) on 14 Nov 2003, 2:28 p.m., in response to message #11 by Patrick Hi Patrick Thanks for the link - I had forgotten about that thread (as well as missing the fact that Dr Kahan's article was on my CDs but every cloud has a silver lining - I found some other articles on root-finding on the Berkeley site so have some more reading). Best James

Re: Many thanks Message #14 Posted by Gordon on 15 Nov 2003, 9:13 a.m., in response to message #11 by Patrick Let us know when your article is ready. I am looking forward to reading it!

Re: Looking for HP Journal article Message #15 Posted by John on 15 Nov 2003, 9:13 p.m., in response to message #1 by james (UK) Does anyone know if there are any HP Journal Articles about how the HP Calculators (41, Voyagers, 28s, 32s or even the 48's) are manufactured and how they were designed? I saw one about the 11c and was wondering there were more? I can't seem to get enought of this information. I am very interested in learning how these calculators are put together, from the ground up. And, if there are articles, how would I go about obtaining them? Thanks.

The MoHPC CD set or DVD has scans... Message #16 Posted by Karl W. Schneider on 16 Nov 2003, 3:52 p.m., in response to message #15 by John John -- Browse this hpmuseum website to find the CD-ROM set and DVD that includes scans of HP Journal articles. Quite a few articles focusing on specific models are available.

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