Why did they separate Cas and noncas?

02162014, 02:24 AM
Post: #1




Why did they separate Cas and noncas?
I googled and searched this forum without finding a satisfying answer. What are the advantages of separating the two modes?


02162014, 02:53 AM
Post: #2




RE: Why did they separate Cas and noncas?
A discussion on that topic was held last December before the board went to the new software: http://www.hpmuseum.org/cgisys/cgiwrap/...591#257591
<0ɸ0> Joe 

02162014, 03:25 AM
Post: #3




RE: Why did they separate Cas and noncas?
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. 

02162014, 08:44 AM
Post: #4




RE: Why did they separate Cas and noncas?
(02162014 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 builtin 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 usercreated 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. <0ɸ0> Joe 

02162014, 02:46 PM
(This post was last modified: 02162014 02:56 PM by Dominik Holenstein.)
Post: #5




RE: Why did they separate Cas and noncas?
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 

02192014, 03:18 AM
Post: #6




RE: Why did they separate Cas and noncas?
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? 

02222014, 05:33 PM
(This post was last modified: 02222014 05:56 PM by eried.)
Post: #7




RE: Why did they separate Cas and noncas?
: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 noncas as a gift, instant boomer; but at last something kinda required by education viewpoint)
My website: erwin.ried.cl 

02232014, 09:56 PM
(This post was last modified: 02232014 09:57 PM by John R. Graham.)
Post: #8




RE: Why did they separate Cas and noncas?
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 

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