Pocket calculators

[chattius 2,525]

I just recognized that our oldest took my HP-50g calculator with her when she leftfor one year infrance.

So im currently looking for a new calculator.anyone of you still uses them? Or is it just an app on your tablet for most of you?

 

http://www.hpgraphingcalc.org/prime.html

 

I was thinking about buyimg the new HP-prime. Main reason is that I am so used to UPN notation. Thecalculator will probably be used by our 14 year old too. I would give a calculator aay to a friend when doing homeworks togther, but would I hand over a tablet to a classmate?

 

I know TI has a dual solution: calculator togther with an app for tablets and can run on windows. But no UPN.

 

What is your favourite calculator?

[wolfie2kX 528]

Ok.. Took me a few to figure out what you meant by UPN - Umgekehrt Polnische Notation or Reverse Polish Notation...

 

Truth be told, I've never had a need for this. My cell phone has a fairly basic calculator in it that does 99.9% of what I need on the road. I do have one on my tablet, but it too, is about as basic as it gets. The one in Windows 7 is probably the most "complex" one I use - and I only use the basic mode most of the time, unless I need to do something like figure out the difference between dates, or convert US measure to Metric.

[chattius 2,525]

I want a CAS, computer algebra system. Just for on the road calculations

Like a barrel has a given size, it is placed at this angle, the vertical height of liquid is such, what is the amount of liquid still in. And a barrel is an easy shape.

[masteff 64]

You can find CAS apps for iphone and android. A good one might cost some money. But it would be a fraction of the cost of the HP Prime. But the HP Prime is dedicated hardware and processor that you know has been rigorously tested so you can have near absolute confidence in the answer being correct. Seeing as you work with explosives, I'd rather be absolutely confident in my answers.

 

If you just want the calculator for "fun" stuff (not for critical explosive calculations), then you might look at the apps first. I googled computer algebra system app and found several with 4+ star ratings, but I didn't look closely at them or read any of the reviews.

[wolfie2kX 528]

Yeah.. On that note, I gotta go along with Masteff... Absolute certainty with explosives is a good thing..!