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solved-New HP prime battery problem ??

**MathWizard**:

solved

Yeah thanks for the firmware link, I'll have to see what mine is. So far the graphing utility is helping out, like graphing decaying sine waves for circuits. So far it is a lot easier to graph stuff in this than say Octave GNU. I'll have to check out the PC HP Prime version, sometimes that should be better to use than the calc. But yeah no regrets about buying this, I can far more easily compare LTspice sims to my calculated functions for once.

And it's very fast.

skip to bottom post...seems to be battery problem ?

I dabble a bit with GNU octave on PC, but I most of the math I do is on a scientific calc, or by hand. My calc can do 3rd degree polynomials, and 3x3 matrices, but only with real numbers.

I would like to be able to solve some higher order matrices w/ complex numbers, or find Eigenvectors, on a calc. It would be nice to solve some ODE's on a calc too, and plot stuff like that, without needing to learn code every time.

And what about tablet's, are they making super graphing calculator's the size of tablets ? Or can you get tablets that would run all the common PC programs ?

I'm just watching a few overview videos

IDK if LTSpice has an easy way to plot ideal models, or equations. But too often, IDK if my answers are off, or if the sim is just doing something more complicated than my equations. But I like how in LTSpice you can plot something and then drag cursors around. I hope I can do that in GNU octave too.

Whats a more user friendly math program, that does plots and solves ODE's, without needing so much coding ? I guess there's not that much to doing systems of 1st orders equations, I've done it before. But if I had a simpler program, that was more point and click, I'd use it.

Either way I should get a gfx calc., any recommendations ?

**alm**:

In my opinions calculators are worth it for simpler tasks due to their dedicated keyboard, fast boot time and small size. Or if you're in school taking a test where no computer is allowed. But for anything more complicated I prefer to use a computer with a bigger screen. That's why no one makes calculators for engineers anymore.

I'm an RPN person, so I'd prefer the discontinued HP50g. Although I mostly use it for it's capabilities with units. For linear algebra I mostly use Python with Numpy and Scipy. I might look at the HP Prime if I really wanted a new graphical calculator.

There is a version of Octave for Android based on GNURoot. And there are tablets and convertible laptops that can run a desktop OS. I'm not sure if a graphical calculator is so much easier to use than Octave/Matlab once you go beyond typical high school problems. You won't have to program. Just type in text based commands. Not unlike how calculators work.

**MathWizard**:

I'm impressed with the HP prime. I've never had a gfx calc. before, so I'll probably skip all the LCD models, as cheap as some of them are. But there's just no comparing to the big color screen, the speed, or what you can solve on them.

I never tried a RPN calc before, I don't think I've ever seen it mentioned or used in any book I've used. I need a new keyboard too, maybe then I'll use Octave more.

Years ago I think I used Maple or Matlab. Nowadays, don't they charge a yearly fee or something ? So GNU octave tho, is that a lesser polished looking, freeware version of Matlab ?

**HighVoltage**:

I still use the old HP RPN calculators mainly the 11C or 15C.

Or for something quick to be programmed, the Sharp BASIC programmable PC's, mainly the PC1350 or the PC1600.

I never saw a need for a graphing calculator, a real PC is much faster for that or a quick visit at Wolfram Alpha gives a perfect first impression.

And I still have an older version of Maple installed (no yearly fees)

**aeberbach**:

I bought the SwissMicros DM42 because I love the HP RPN machines. I use it most.

The HP Prime is one I bought before the SwissMicros and it's not really a RPN machine though it sorta kinda pretends to be if you want. It is the easiest for matrix calculations and overall is a great calculator, even the keyboard is not bad. A screen protector is vital as the plastic is very soft and will scratch if you put _paper_ on it.

The Ti NSpire CX II that my kids have for school is an abomination and I hate them. I don't want to see Microsoft Excel that often.

But for graphing calculators none of them are anywhere near as good as just about any device that can access a web browser, phone included. Are you ever that far from such a device?

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