stack lift and change sign
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09-01-2014, 10:36 AM
(This post was last modified: 09-01-2014 10:57 AM by walter b.)
Post: #53
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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). 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. 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. d:-) |
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