stack lift and change sign
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09-01-2014, 11:38 AM
Post: #54
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RE: stack lift and change sign
(09-01-2014 10:36 AM)walter b Wrote: 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. I'm not disputing the benefits of Σ+, it was quite amazing in its time, although maintaining all the data individually is a significant step forward on the RPL devices. I really just disagreeing with it's stack behaviour: Code: Y X Σ+ -> Y n is kind of weird. Surely, better is: Code: Y X Σ+ -> ∅ which is a consistent improvement. UNDO or LAST returning the two argument to the stack for the Σ- error correction is better than playing stack games. If the display of n is important, make it a temporary on the screen but don't put it on the stack. - Pauli |
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