Re: Need a new calculator / will there be a successor of HP50g soon? Message #3 Posted by Nigel J Dowrick on 28 Sept 2008, 3:39 p.m., in response to message #2 by Hal Bitton in Boise
To copy results (coordinates etc.) from the graph screen to the Home screen of the TI89, press "green diamond" followed by () (the change sign key). This is described as a "shortcut" in the manual, but I don't know any other way of doing it!
Re: TI89 vs HP50g (I have both)  it depends what you will be using the calculator for. If you mostly do calculations, go for the HP. It's got trig functions, 1/x, square root as primary key functions; the TI89 hasn't. Also, you can redefine the HP's keyboard as much as you like. (The TI's custom menus aren't as useful.) Finally, RPN is great, especially with an unlimited stack depth.
If you want to do simple algebra, choose the TI. Its keyboard is optimized for this with X, Y, Z, T, and the "substitute"  key as primary keys, and derivatives and integrals easy to reach. The HP's basic algebra functions are (in my opinion) hard to find and remarkably nonmemorable. (The indefinite integral menu item is called RISCH, after the algorithm used, and it is deeply buried!) The TI's excellent editor is better than anything on the HP, too. Indeed, the importance of being able to access previous results when doing algebra normally forces me to use the HP50g in algebraic mode, so that I can scroll back through my history, but it still isn't as nice as the TI editor.
But if you need a calculator that knows about Hermite polynomials or can solve nonlinear differential equations analytically (sometimes) you have to have the HP, because the TI is way behind in the truly advanced areas. The only problem is that you will have to resign yourself to printing out the full manual and carrying it around with you; the HP is neither intuitive nor memorable.
The HP looks really cool, though!
