HP Forums

Full Version: Looking for HP Journal article
You're currently viewing a stripped down version of our content. View the full version with proper formatting.

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."

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.

Yes, it is!

I can only give you an hint: I cannot write here where it is.

Greetings,

Massimo

...since Valentin replied with a neutral and valid link.

His reply wasn't there when I began mine: strange how TimeZones work :-)

Greetings,
Massimo

Hi Valentin and Massimo

Muchas gracias and molti grazia (I hope thats right!) for the bed-time reading.

Best

James

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

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

... if I remember correctly, the MoHPC scans of these articles are higher-resolution than the ones available from Cal-Berkeley.

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

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.....

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

Massimo,
could you please contact me at giuseppe.marullo@iname.com ?

Grazie,

Giuseppe Marullo

Let us know when your article is ready. I am looking forward to reading it!

You have new mail! :)

Ciao,
Massimo

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.

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.