> http://www.hydrix.com/edge/graph.php

>> Wow. Sounds incredible. Where can I get it for the 50g? (or is it
>> still in beta testing?)

> The code for the HP50 isn't publicly available yet.

> Jean-Yves

> Wow. I'm completely impressed. Will the demo page be staying up for the
> foreseeable future? I'd like to pass the link along to some friends, but
> it'd be frustrating for them if it disappeared. Cool stuff!

> The fact that you designed this to run on the 50g is really exciting. This
> is truly the first calculator app I'd pay for if it works as well as you
> say it does. (and, judging by the demo page, it looks like it does)

> On 2007-11-04 02:17:43 +1100, "Greg M." <grego...@insightbb.com> said:

>> Wow. I'm completely impressed. Will the demo page be staying up for the
>> foreseeable future? I'd like to pass the link along to some friends, but
>> it'd be frustrating for them if it disappeared. Cool stuff!

> yes, we have no plan to remove the online version in the short term
> future...
> we will probabl add features such as tracing (which the library can do
> already)

>> The fact that you designed this to run on the 50g is really exciting.
>> This
>> is truly the first calculator app I'd pay for if it works as well as you
>> say it does. (and, judging by the demo page, it looks like it does)

> it wasn't designed to run on the hp50 per say, but on any embedded
> platform with restricted CPU power and memory.
> Traditional algorithm made in unpractical until now.

> We hope to bring such plotting capabilities to any calculators as such it
> will require a lots of talks with the concerned parties.
> The ability to identify undefined area and discontinuities is I believe a
> major feature and would make a huge difference to students. it would
> likely require a curriculum change however as edge can do in seconds what
> used to take a lot of time. teachers may not like it as identifying where
> the function is undefined is often the major theme of an exercise.

> Jean-Yves

> --
> They who would give up an essential liberty for temporary security,
> deserve neither liberty or security (Benjamin Franklin)

> http://www.hydrix.com/knowledge/index.php?id=89

>> say you measure 1±0.1 meters
>> and 2±0.1 meters, i.e. you know the two lengths are in the ranges [0.9
>> 1.1] and [1.9 2.1] (in meters).  Then, the sum of them is 3±0.2 meters.

>I'm not sure if this applies to your experimental data, but usually
>when doing calculations with data, the uncertainties don't just add.
>For instance, in your example (1 +- 0.1) + (2 +- 0.1) = (3 +- 0.14).
>In general, (A+-a)+(B+-b) = (A+B +- sqrt(a^2+b^2)).

>See:
>  http://en.wikipedia.org/wiki/Propagation_of_uncertainty#Example_formulas
>for more examples.

>On my 50g, I have routines for doing common operations (+-*/^) with
>uncertainties, so that doing calculations with uncertainties is
>essentially no more difficult than doing regular calculations (thanks
>to RPN)

>   {1.  0.1} {2. 0.1} ?ADD

>instead of

>   1. 2. +

>If the uncertainty in your data has a uniform distribution instead of
>the more typical normal distribution, then your result of (3 +- 0.2)
>is correct.

>-wes