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timofonic · 01-20-2016, 02:58 PM

(01-18-2016 01:41 PM)Luigi Vampa Wrote:
(01-18-2016 03:18 AM)timofonic Wrote: Crazy idea: What about merging with newRPL project too?
RPL has its own fan club.
An RPL-programmed scientific calculator always includes an RPN stack. Nevertheless, an RPN key-stroke-programmed scientifc calculator doesn't necessarily need to include RPL. I am not aware of any such model.
That being said, I must say I do enjoy RPL programing in my HP28s & HP48sx, but WP34s, and prospect WP35s project, seem to have a very strong base of 'pure-RPN' supporters.

BR MfG +
Don Luigi

It's probably due to my ignorance, but I fail to see why both "worlds" can't be merged.

Can't RPL be used as a scripting system to add features instead code in C/C++ all time?

This would make the calculator more expandable and need less harder ti write code. Maybe the code could be compiled to make it run faster, or use some kind of Android's ART approach.

- Of course, it seems there are people allergic to LISP and derivatives.

+ But seems math nerds love it: Scheme.
* Functional programming language Haskell got influence from LISP.

There's a weird LISP dialect called Clojure that is gaining lots of popularity and used even by big corps, but it's some kind of slave language for JVM. I fail to understand the reasoning about why people are so attached to a programming language owned by Oracle, a company with a very predatory and shady reputation in a similar or worse way than Microsoft.

GoferLists (Advanced List Operations) got inspired by some Haskell libraries too.

(01-19-2016 03:45 PM)walter b Wrote: Seems you may get almost everything you request but the colored display segments.

We will have a pure alphanumeric display. Though within 132x16 pixels, the digit 8 (in a 5x9 matrix) will hardly look any different than shown. Feel free to propose a better digit design. Looking forward to it,

Well, these days I have a FX991EX and consider that screen the minimal for a new product. Maybe I'm a snob or maybe my eyes get tired easily for different reasons ( far-sightedness + astigmatism, ADHD, using computers and soldering all day, etc) Wink

I got tired of finding if someone did the BoM of the calculator, but it features a 192×63 dot matrix display.

Segmented-based LCD displays

I liked this historical article aboutcalculator display technology

I liked this an article comparing different display technologies(2). I did the maths and clearly EPD is the winner! I'm not sure about the different case scenarios and low volume availability , I didn't research enough for that.
JDI Announces Start of Sales of a Standard Line-up of Ultra-low Power Consumption Memory-in-Pixel Reflective-type Color LCD Modules

There's an interesting comparison of nextgen display tech at Wikipedia.

Is EPD fast-enough for a calculator?

+ It's cool to make your DIY crap and easy for novices to use them.
- Very limited graphic capabilities: What about menus or representing different symbols?
- There's issues about visibility and confusing symbols, too.

Interesting lecture: [URL=]Don’t use 7-segment displays, by Harold Thimbleby[/url]. FIT Lab — Interaction Laboratory, Swansea University
Swansea, Wales

I fail too see why segmented displays are still used:

There's great technologies that allow a lot more of definition with very low power: eINK is one great example

+ This would provide the possibility to provide graphing calculator capabilities.
*I know this project is aimed at old school style and such, that's "okay".

+ Menus would be able to be more descriptive and easy if properly designed.
+ It can be useful for more uses other than a calculator, but somewhat of a long pocket computer:
* Data acquisition/logging and visualization for research purposes.
* Symbols and numbers could be rendered in a more visually appealing way, bigger for people with vision issues or some extreme conditions.

(01-20-2016 05:21 AM)Paul Dale Wrote:
(01-19-2016 03:40 PM)walter b Wrote: regularized Beta
If you want the statistical distributions, you'll have this one.

- Pauli

(01-19-2016 03:40 PM)walter b Wrote: And finally about math: the WP 34S contains some mathematical functions no other pocket calculator contained so far, AFAIK (e.g. Gudermannian, Lambert's W, regularized Beta, etc.); this is a subset of its function set I would not extend without need - or (as another member wrote): we don't need a canned encyclopedia. Hope this explains the matter.

Regarding your point 2: Looking at its dimensions (165.5x77x11 mm), the Casio Classwiz belongs to the battleship class of calcs IMHO. Too large for my shirt pocket.

Excuse me.

For us the math newbies: What do you consider to be "arcane math"?

Why aren't you going to implement it? What are the possible challenges?

What's so wrong about having a "canned encyclopaedia"? Do you know Project Euler What about using the calculator as a Inductive Chain Learning tool in order to motivate math learning by game-like software?

2. FERNÁNDEZ, María Rodríguez; CASANOVA, Eduardo Zalama; ALONSO, Ignacio González. Review of Display Technologies Focusing on Power Consumption. Sustainability, 2015, vol. 7, no 8, p. 10854-10875.