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

--- Quote from: xrunner on March 06, 2017, 02:37:35 am ---I was browsing Ebay and just for the fun of it searched for the HP 42S (which I still have). They are going for over $200! But I'm not selling mine.  :)

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I'm not selling my HP calculator either. That would be anti-TEA and my other HP gear wouldn't be too happy about it. :-DMM
eugenenine:

--- Quote from: rstofer on March 06, 2017, 08:25:11 pm ---
--- Quote from: eugenenine on March 06, 2017, 07:57:03 pm ---
--- Quote from: rstofer on March 06, 2017, 07:54:53 pm ---
For the last month, I have been playing with wxMaxima on a PC and it is terrific!  No calculator will ever compare to this CAS (Computer Algebra System) with a 27" screen.  About this, I am an evangelist!  I believe!

Not all that many people actually need a CAS in their everyday lives.  Those who work in tech probably do but they are probably already using such a thing.  Everybody in a college STEM program needs something.  I just use the calculators for grunt number crunching.


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I grabbed the slackbuilds for this the other day, I just need to find a good tutorial on getting started

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If you are asking about wxMaxima, there are two great books that have terrific examples specifically related to wxMaxima for Calculus.  It's simple enough to just take the ideas and put them to use in other areas.

https://wxmaximafor.wordpress.com/

The User Manual is online but it doesn't seem terribly approachable.  It is great as a reference, not so much as  a tutorial.

I have attached the code for a "Ball Thrown In Air" physics problem.  The gravitational constant shows clearly that the experiment wasn't done on Earth.  The two graphs are included.  If you want, just retype the code and see how it works out.  I get most of my education by copying.

It is worth noting that the entire problem is contained in lines 2..6.  Everything else is just gilding a lily.
Line 2 defines the gravitational constant
Line 3 defines the initial velocity
Line 4 describes the standard equation for motion: H(t)=V0t+1/2at2
Line 5 takes the derivative of the function in Line 4 to get v(t), the velocity as a function of time.  Note that wxMaxima does the derivative, I didn't have to provide it.
Line 6 finds the time when the ball impacts the ground by looking for the second root (away from 0) for the H(t) equation.  In other words, where H(t) = 0 with t <> 0.

That's it!

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Yes, wxMaxima

But now I need to re-learn calc and / or physics, the old hdd is getting quite fragmented.
eugenenine:

--- Quote from: bitseeker on March 06, 2017, 10:35:25 pm ---
--- Quote from: eugenenine on March 04, 2017, 12:59:23 am ---I used to get magazines from the library with ads for hp calculators, it was like playboys for nerds.
I graduated high school and then 48sx was released and I worked and saved months for it and finally saved up the $300 and bought it from a store called service merchandise.  It was under glass like in a jewelry store so I made my purchase then went to the waiting room where the product you bought came out on a belt like luggage in the airport.  I almost cried when that little box finally came down the belt for me.

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Holy smokes, that might've been where I bought my 28S back in the day. Been using RPN ever since, even for simple calculations. As someone else posted, Free42 works a treat. Or if you want the HP look, Droid48.

I haven't used my 28S in ages. Perhaps I'll hunt down some N-size NiMH rechargeable batteries (it uses three cells).

--- End quote ---

I don't know how big of a chain they were.  I bought mine in Columbus Ohio, it was on Hamilton Road.
bitseeker:
Service Merchandise seemed to be everywhere. I remember many fun times watching for my purchase to rumble down the conveyor.

NiMH N-type (aka LR-1) batteries seem to be hard to find in the US. So far, I'm only locating sources in the UK.
eugenenine:
N size NIMH?  Amazon, battery junction, etc all have them.
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