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+--- Thread: Why did they separate Cas and non-cas? (/thread-686.html)
Why did they separate Cas and non-cas? - DeucesAx - 02-16-2014 02:24 AM
I googled and searched this forum without finding a satisfying answer. What are the advantages of separating the two modes?
RE: Why did they separate Cas and non-cas? - Joe Horn - 02-16-2014 02:53 AM
A discussion on that topic was held last December before the board went to the new software: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=257591#257591
RE: Why did they separate Cas and non-cas? - DeucesAx - 02-16-2014 03:25 AM
Is that it? It boils down to me either wanting 3.46... or 2*sqrt(3)? Why not just something more like press enter for exact and shift enter for approx? (I don't even have the calculator yet it arrives Monday, but I really need to hit the ground running with it)
Can I turn off the default setting that each variable is initialized as 0 in the home mode? Im scared I forget about that in an exam.
RE: Why did they separate Cas and non-cas? - Joe Horn - 02-16-2014 08:44 AM
(02-16-2014 03:25 AM)DeucesAx Wrote: Is that it? It boils down to me either wanting 3.46... or 2*sqrt(3)? Why not just something more like press enter for exact and shift enter for approx?
Good news: They must have either read your mind, or you read theirs. You can do exactly what you suggested in CAS. Check it out:
\(\sqrt{12}\) Enter --> \(2\sqrt{3}\)
\(\sqrt{12}\) Shift Enter --> 3.46410161514
\(\sqrt{12}\) Enter [a b/c] --> both answers (best of both worlds!)
HP made it exactly the way you suggested. Cool, huh?
Quote:Can I turn off the default setting that each variable is initialized as 0 in the home mode?
No, because the built-in Home variables are like the 4 stack levels in traditional RPN calculators, always existing and always containing something. Prime's A through Z always exist, and contain zero until you replace the zero with some other real number; Z0 through Z9 always exist and contain zero until you store a complex number in them; and so on.
Quote:Im scared I forget about that in an exam.
No problem: to avoid accidentally using a variable that you didn't initialize, stick to user-created variables, which can nicely have descriptive names, and do not exist until you store something in them, and cease to exist when they are deleted.
RE: Why did they separate Cas and non-cas? - Dominik Holenstein - 02-16-2014 02:46 PM
Here is a similar apporach if Exact is checked in your CAS settings:
\(\sqrt{12}\) Enter --> \(2\sqrt{3}\) --> symbolic result
[a b/c] --> 3.46410161514 --> numeric result
[a b/c] --> 3650401 / 1053780 --> exact result
See the attached screenshot.
Best,
Dominik
RE: Why did they separate Cas and non-cas? - DeucesAx - 02-19-2014 03:18 AM
Thank you. I guess for now Ill just use the CAS mode at all times.
Could you give some examples where it would be advantageous to use both at the same time?
RE: Why did they separate Cas and non-cas? - eried - 02-22-2014 05:33 PM
:O maybe this separation (illogical from an engineer viewpoint) was to offer the ability to block the CAS :O? (I realized this thinking on how TI handled this... 2 different calculators, one without CAS, one with... a much worse decision, imagine if you got the non-cas as a gift, instant boomer; but at last something kinda required by education viewpoint)
RE: Why did they separate Cas and non-cas? - John R. Graham - 02-23-2014 09:56 PM
One other nuance is that CAS mode doesn't currently support RPN entry: if you want exact results, you're stuck with algebraic entry—and extra keystrokes.
- John