|Re: What are they waiting for?|
Message #5 Posted by Vieira, Luiz C. (Brazil) on 7 Mar 2003, 8:53 a.m.,
in response to message #4 by Jeremy
I'm an Electrical Engineer and, believe-me, at the time I learnt Symbolic Integration it was obscure even without a calculator... Imagine what should a tool be able to perform if it is designe to support obscure activities. It should be an "obscure" tool, indeed. I tried MthLab once, and Integration happens in a hidden form, if you accept this as so (I remember using an old version, not sure about which one). I heard about Mapple and never used it. I am trying to find Mathematica (is it correctly spelled?) and try it.
If you have a palm or a portable to run any of them, you still have to buy and install them. What amuses me is that you can perform a full Memory Clear in an HP48/49 and still have all resources available; not even a (beep), memory search, P.O.S.T., system load, graphic environmetn load, then you are ready to check if your Math tool is already there or, if it's a friend's computer, search for its existence.
I know palms do not restart everytime they are switched to ON, but I heard that the best math tools some of them have are the HP selected calculator emulator... Funny, isn't it?
I'm a portable-math-tool guy, I do not care if the tool is algebraic or RPN, it must be a good tool. Slide rules are neither RPN nor algebraic, they simply rule (wow!). I also program in C/C++, and it demands algebraic notation knowledge. No way out...
What I know is that whatever the HP48 has, it's written and described somewhere. I'm a bit lazy, but I remember doing some symbolic handling in the HP28S and found it a "must have" at the classroom (I was at the University at that time). Symbolic integration in the HP28S is only achieved by expanding the final expression as a Taylor equivalent to the symbolic result, final prcison expressed by the number of terms. Weird... but efficient. I learnt a lot with it.
Later the HP48SX enhanced integration process and allowed symbolic results. The HP49 is even better.
My first calculator was a TI57, and I'm sad not having it anymore: the case was destroyed. I still have the electronic "guts", say, teh PCB with the all-built-in IC and LED's display. I connected a 9VCC battery a few days ago end it worked instantaneously! I just have no idea about the keyboard matrix connections, but I'll not work on it for now, maybe in the end of this year. This TI57 is algebraic (whatelse is new...), LED display, has 8 storage registers and 50 program steps, subroutines granted and merged codes (up to three keys per step). Something to be kept.
At the time I was given this calculator, symbolic integration was already obscure...
What expects us in the future?
Luiz C. Vieira - Brazil