Yes, I read your followup, but... Message #10 Posted by Karl Schneider on 1 Oct 2004, 1:15 a.m., in response to message #6 by .
... your statements still deserve comment, even though you subsequently admitted to not having read the full context of the thread:
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All that to solve 45=12(1.04)^n, and the answer takes "less then 30 seconds"? While you are messing about with that, your classmates have already solved the equation and have moved on.
Only if they solved it algebraically, as is easy to do on the 11C/15C. BTW, it's "than 30 seconds", as I wrote. Faster if the initial guess is close...
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While the HP15c is a great tool for number crunching, I don't think that type of solving is one of its strengths. If you must have RPN, and you are permitted graphical calcs, maybe a 48gii / 49g+ would be the way to go.
Sure, the 48G-series and 49-series models have the slick fill-in-the-blank equation solver. To get it on the HP 48G-series, hit right-shift SOLVE (but not left-shift SOLVE). On the HP-49G, first locate the "NUM.SLV" in red print on blue. I hope that the KinHPo 48GII and 49G+ are clearer and more intuitive, but I'm not paying good money to find out.
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Num Slv -> 'Solve Equation' -> fill in ''45=12(1.04)^n'' and go SOLVE, to give the answer in a second or so. No need to fiddle about trying to write programs.
This doesn't work on the HP 48/49 models as stated ("invalid syntax") because implicit multiplication is not supported. After making this mistake, more time is spent editing the equation to read '45=12*(1.04)^n'
BTW, the 15C program is not all difficult to enter; it can be done in less than 15 seconds. No hunting for "=" and "N" (don't forget to use ALPHA mode).
On solving functions defined as programs on any RPL-based 28/48/49: Can it even be done? If not, how would the user solve some "function" that included a loop or conditional test? I asked this question in this Forum a while ago, and got no satisfactory answer from anyone.
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Just something to consider...
Consider it considered. ;-)
Even without the text-field menus and high computational speed, single answers to problems like these can often be obtained more quickly start-to-finish with less mental effort on the 15C, because there's no hunting for functions or correcting syntactical errors.
-- KS
Edited: 1 Oct 2004, 3:04 a.m.
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