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stack lift and change sign
09-01-2014, 10:36 AM (This post was last modified: 09-01-2014 10:57 AM by walter b.)
Post: #53
RE: stack lift and change sign
(08-31-2014 09:52 PM)Paul Dale Wrote:  
(08-31-2014 08:50 PM)walter b Wrote:  On the 42S, ENTER always duplicates - on the 48, ENTER only duplicates if the entry line is empty. Personally, I prefer a function doing the same always (remember you've no chance to follow that weird behavior of ENTER on a single line display).

ENTER isn't a great example of the problems, ...

Wink

Quote:ENTER on a classic RPN putting the new value in X and Y is inconsistent. That doesn't make sense and is truly weird ...

Why?

Quote:What about Clx, Sigma+, Sigma-? They all disable stack lift. They introduce an inconsistency which simply wouldn't occur without the stack lift kludge.

CHS sometimes sets lift and sometimes doesn't.

Seems there is some explanation necessary for the younger generation: Way back before scientific pocket calculators were available (unbelievable though there was such a time), scientists and engineers and students (you know which) had real calculating problems e.g. doing experiments and repeated measurements and the like. Thus, already the HP-45 featured a very (!) useful key labeled Σ+. It was the key every experimentalist was waiting for. It solved that problem once and forever and in a reasonable way - with Σ- inverting it. Nowadays, maybe it would be marketed "calling the Σ-App" but then nobody knew about apps but was happy with a working solution. And since the solution worked it was kept this way until today. So much about Σ+ and Σ- and why they work as they do IMHO. Of course, more complex solutions were and are always makeable, too, but why should one?

CLx and CHS may be covered later. Wink

d:-)
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Messages In This Thread
stack lift and change sign - Thomas Klemm - 08-10-2014, 09:48 AM
RE: stack lift and change sign - walter b - 08-10-2014, 11:44 AM
RE: stack lift and change sign - d b - 08-11-2014, 06:08 AM
RE: stack lift and change sign - Paul Dale - 08-11-2014, 06:21 AM
RE: stack lift and change sign - walter b - 08-27-2014, 11:30 AM
RE: stack lift and change sign - d b - 08-27-2014, 02:32 PM
RE: stack lift and change sign - walter b - 08-27-2014, 03:57 PM
RE: stack lift and change sign - Andreas - 08-27-2014, 07:40 PM
RE: stack lift and change sign - d b - 08-29-2014, 04:45 AM
RE: stack lift and change sign - walter b - 08-29-2014, 09:15 AM
RE: stack lift and change sign - walter b - 08-29-2014, 09:47 AM
RE: stack lift and change sign - walter b - 08-29-2014, 04:11 PM
RE: stack lift and change sign - walter b - 08-29-2014, 07:54 PM
RE: stack lift and change sign - walter b - 08-31-2014, 06:23 AM
RE: stack lift and change sign - walter b - 08-29-2014, 08:21 PM
RE: stack lift and change sign - Les Bell - 08-11-2014, 01:41 AM
RE: stack lift and change sign - Paul Dale - 08-11-2014, 06:44 AM
RE: stack lift and change sign - walter b - 08-28-2014, 08:33 PM
RE: stack lift and change sign - Paul Dale - 08-28-2014, 10:05 PM
RE: stack lift and change sign - walter b - 08-29-2014, 12:55 PM
RE: stack lift and change sign - walter b - 08-29-2014, 01:25 PM
RE: stack lift and change sign - walter b - 08-29-2014, 02:04 PM
RE: stack lift and change sign - walter b - 08-29-2014, 02:25 PM
RE: stack lift and change sign - walter b - 08-29-2014, 03:05 PM
RE: stack lift and change sign - Paul Dale - 08-31-2014, 07:25 AM
RE: stack lift and change sign - RMollov - 08-31-2014, 09:40 AM
RE: stack lift and change sign - walter b - 08-31-2014, 11:26 AM
RE: stack lift and change sign - walter b - 08-31-2014, 08:50 PM
RE: stack lift and change sign - Paul Dale - 08-31-2014, 09:52 PM
RE: stack lift and change sign - walter b - 09-01-2014 10:36 AM
RE: stack lift and change sign - Paul Dale - 09-01-2014, 11:38 AM
RE: stack lift and change sign - walter b - 09-01-2014, 06:56 PM
RE: stack lift and change sign - walter b - 08-29-2014, 09:21 PM



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