Electronics > Beginners
EE Pros: Is RPN still relevant?
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orolo:

--- Quote from: TNorthover on March 04, 2017, 07:56:36 pm ---That's a bit of a stretch. There's no notion of a stack in conventional mathematics, and the notation is definitely infix.

If I had to say any paradigm was "the mathematical way" I'd go for declarative, like prologue. A mathematical expression representing a series of constraints on the variables involved that may or may not uniquely determine a result.

--- End quote ---
Any basic algebra textbook will define addition of real numbers as a function from the cartesian product of the real numbers into themselves \$+ : \mathbb{R}\times\mathbb{R} \longrightarrow \mathbb{R}\$, taking a couple numbers into their sum. That is, addition takes a tuple of reals into a real number. Taking a tuple is essentially the same as taking a couple of elements from the top of a stack. When one uses infix notation, one is implicitly currying the addition function, which is in fact stretching its algebraic definition.
Elf:
Ah, this thread made me nostalgic for the HP 42s I used to use. I went looking to see if you can still get them, but they seem to go for hundreds of dollars now, and it seems that HP's recent (although now decade old) engineering efforts with the 35s have been disappointing.

Instead I bought a SwissMicros DM15L clone of the HP 15C.
claytonedgeuk:
When the Swissmicros shows up...can you report back?  I don't think there is even any attempt to conceal the inspiration...but would be keen on hearing how well it matches up.

Sent from my SM-G900F using Tapatalk

Elf:

--- Quote from: claytonedgeuk on March 04, 2017, 08:47:32 pm ---When the Swissmicros shows up...can you report back?  I don't think there is even any attempt to conceal the inspiration...but would be keen on hearing how well it matches up.
--- End quote ---
Sure!
Gyro:

--- Quote from: David Hess on March 04, 2017, 08:09:47 pm ---Besides being faster and ultimately easier to use, I like RPN for the stack which holds, and in the case of the HP48g and HP50g, displays multiple results.  I prefer a calculator over using a PDA/phone or computer because it is portable, the battery life is effectively unlimited, and the interface is better.

While the HP50g has many improvements over the HP48g, it is a step back as far as user interface performance (it is several times slower) and the PDA/phone calculator programs I have tried except for my old Palm Pilot are even worse. :(

--- End quote ---

As mentioned in the HP16C thread I still use NEOCAL on my old Palm TX. It can be set to display 4 lines of the RPN stack (X,Y,Z,and T) though you can set the stack deeper than that. It does algebraic too, so you don't see RPN in most of the screenshots.

I believe the free lite version for Android has the same capability, though misses out on programmer, Financial, etc. functions. I haven't tried it myself, I have a Nokia 3310 (Hey, I'm trendy again  :D)

http://www.hudren.com/products/neocal/
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