CAS seems to Be in Auto Simplify Mode

06092022, 04:08 PM
Post: #1




CAS seems to Be in Auto Simplify Mode
When in CAS mode
If I enter 3x17=22 Then hit enter Then place () parenthesis and go copy the equation such that I have (3x17=22) Then add +17 >> (3x17=22)+17 I get 3x=w39 as it is in CAS mode I am expecting 3x17+17=39 I am running the latest OS. Does CAS mode simplify on the fly whenever possible in v2.1.1.4603? Thanks Tim C. 

06092022, 04:20 PM
Post: #2




RE: CAS seems to Be in Auto Simplify Mode
See the attachment for a better overview


06092022, 06:08 PM
(This post was last modified: 06092022 06:13 PM by C.Ret.)
Post: #3




RE: CAS seems to Be in Auto Simplify Mode
(06092022 04:08 PM)tim_crouse Wrote: I get 3x=w39 as it is in CAS mode I am expecting 3x17+17=39 Check your settings in the Shift CAS Setting page; your preference corresponds to Simplify: None. (06092022 04:08 PM)tim_crouse Wrote: Then place () parenthesis and go copy the equation such that I have (3x17=22) Make it easy, enter your expression (or equation) and simply press + 1 7 ENTER. The HP Prime will do all the copypaste for you using the powerfull local Ans function. You may also enter ans directly ( Shift + key). Note that default Ans is Ans(1). And furthermore Ans(2) , Ans(3), ... etc are references to the older answers store in the displayed queue. 

06102022, 01:46 PM
Post: #4




RE: CAS seems to Be in Auto Simplify Mode
Thank You. Each of your answers was spot on.
I apologize for the length of the following question Could you provide some insight into the xTheta key? In general I have a hard time getting solve to work in CAS mode. Folks mention it is because the equations are numeric and not symbolic. I ask these questions because when I try to experiment I get syntax errors so some guidance would be helpful. . . I know I will have a syntax error or some error when the exTheta produces an "a" or "A" but when it provides a variable in the form of "x" it always seems to work. To add more confusion to my mind on the subject I see multiple ways to invoke the solve operation: OPTION 1 Set up HOME >> APP >> SOLVE hit esc to exit to commandline mode "Solve" is in the title bar. Do I then hit the toolbox key and select either CAS Solve or App Solve or do I simply enter an equation? xTheta provides "A" in this mode OPTION 2 Set Up HOME >> APP >> FUNCTION >> ESC xTheta provides "X" in this mode Tap CAS, CAS and FUNCTION displayed in title bar xTheta provides "x" in this mode, I believe to be because CAS requires lower case VARs TOOLBOX >> CAS TAB >> SOLVE OPTION 3 Set Up >> HOME >> APP >> FUNCTION TOOLBOX >> APP >> SOLVE >> SOLVE Solve.SOLVE() xTheta provides "X" in this mode OPTION 4 Set Up >> HOME >> APP >> FUNCTION TOOLBOX >> CAS >> SOLVE >> SOLVE CAS.Solve() xTheta provides "X" in this mode I am thinking this is prone to syntax errors as the is "X" and not "x" as I think this is a CAS setup that a lower case VAR is required. There are so many solve modes for basic equations that I get lost in which one I should use. (and I haven't even covered the use of solver apps which I think should be straightforward as they are dedicated to a specific type of solve operation, Eg Triangle or Finance . . . I guess what I am asking is how do I know when solve will work without a syntax error and does it truly make a diff what xTheta provides? I understand the concept that xTheta provides the VAR based on the current mode the calculator is in. Some of my frustration is that I am transferring from a TI NSpire CAS which adjusts the calculation mode automatically between numeric and symbolic resulting in fewer syntax errors (for me that is). Any advice you could offer would be appreciated. I have asked this question previously and the answer is that CAS is for symbolic and nonCAS is for numeric. My understanding of this is: Use numeric when you want an exact answer, Eg x = 1 Use CAS when you expect an approximation or an equation as an answer: x=2/3 or x= x4 Is there a setting to have the Prime go into an auto mode when it comes to selecting the calculation mode it uses? Thanks in Advance Tim C. 

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