Re: Are HP Prime CAS and TI NSpire CAS the same? Message #6 Posted by Tim Wessman on 30 Oct 2013, 1:05 p.m., in response to message #4 by CompSystems
There is a large difference between "the results are not formatted in the way I want", "the CAS does not make assumptions such as switching from exact into approximate automatically", or "I don't understand how to tell the CAS to give me the results I want" (which is the root of nearly all your comments) and what I am saying which is "the CAS in prime is much more powerful and capable".
All your examples are simply further statements of what I have already said  "the CAS in Nspire has been polished". However, what I am saying is that the CAS in prime has more capability, has more algorithms implemented and hence can solve a much wider range of problems. The Nspire is very good at the types of things you will encounter in a classroom because that is basically exclusively where they have focused.
Are you saying that HP should exclusively focus on classroom only things and ignore engineering or professional users? I would think the majority here would disagree with that. While Prime right now may not work for a group of 50g users, I think there is a big group of others that have been pleasantly surprised!
int(sin(x)*ln(x),x) > ln(x)*cos(x)+Ci(x) on the nspire??? (does here on my unit) Does the Nspire have Si, Ci, Zeta, Ei, or other special functions you will never hit in in a classroom? Didn't think so.
Please let me know how long it takes to symbolically solve int(sqrt(tan(x)),x) on your nspire... (hint, it will run for 5 minutes or so and run out of memory)
We have also tested extensively in the AP calculus exams the problems that have *completely* been unsolvable on any TI calculator using the CAS. In nearly *every* case, Prime's initial release could solve those symbolically whereas the TI CAS could not solve them either numerically or symbolically (which resulted in a LOT of very angry students and teachers for those exams that year).
True, there will be plenty of specific examples of types of problems that work in 1 CAS system, but not in another. There always will be due to the nature of math and software. However, just a casual perusal through the calculus menu, the matrix menu, or nearly any menu on Prime will find a huge range of things that the Nspire does not have, and is *very doubtful* they will ever add. The Nspire is supposed to be a pure teaching tool. Anything that detracts from that (based on 4 years of watching) will never be added.
While I appreciate your enthusiasm and time you spend making these gigantic images, they are about the most unhelpful format to communicate to HP any sort of change. If you'd like us to look at the behavior of a specific thing, please provide plain text input, output, and expected results. I just don't have time to dig through gigantic Photoshopped pictures to try and glean items. As you've pointed out, there is still a ton of polish work that needs to go into the calculator so I will be spending my time primarily on that task.
If you could please provide all your examples in plain text, I can then make every effor to ensure they either work directly, or there is effort made to clarify the correct way to solve that in Prime.
Thanks!
TW
Edited: 30 Oct 2013, 1:09 p.m.
