What's the difference in all the polynomial solve/root/zero functions?
09-07-2015, 06:11 PM
Post: #5
 ewjax Junior Member Posts: 7 Joined: Sep 2015
RE: What's the difference in all the polynomial solve/root/zero functions?
(09-07-2015 04:09 PM)parisse Wrote:  solve and zeros are different in TI mode in Xcas, but not on the Prime (except for delimiters). Both are exact commands and can also solve equations that factor and reduce to polynomials. proot is always approx and strictly for polynomials.
I can not reproduce the complex mode switch you describe with cZeros.

Thanks for the insight, I very much appreciate the rapid response! I guess I need to learn more about Xcas.

Questions:
- What are some examples of expressions that factor into polynomials, that aren't already polynomials themselves?
- From the standpoint of user interface design, doesn't it seem confusing to have multiple menu options that all actually do the same thing and return the same answer? Perhaps it is just my slightly OCD nature getting in my way here.

To reproduce the complex mode switch in cZeros I perform the following:
0. In CAS mode
1. Shift-CAS
2. On page 1, ensure "Use i" is un-checked
3. Escape
4. Toolbox / Solve / Complex Zeros ->cZeros() is placed on command line
5. type in cZeros(x^4-1=0)
6. Enter. Answer is returned as [-1 i 1 -i]
7. Shift-CAS. "Use i" is now checked

Confirmed the behavior with both the HP Prime and the Virtual Prime emulator.
 « Next Oldest | Next Newest »

 Messages In This Thread What's the difference in all the polynomial solve/root/zero functions? - ewjax - 09-07-2015, 04:59 AM RE: What's the difference in all the polynomial solve/root/zero functions? - parisse - 09-07-2015, 06:35 AM RE: What's the difference in all the polynomial solve/root/zero functions? - ewjax - 09-07-2015, 03:25 PM RE: What's the difference in all the polynomial solve/root/zero functions? - parisse - 09-07-2015, 04:09 PM RE: What's the difference in all the polynomial solve/root/zero functions? - ewjax - 09-07-2015 06:11 PM RE: What's the difference in all the polynomial solve/root/zero functions? - Terje Vallestad - 09-07-2015, 07:44 PM RE: What's the difference in all the polynomial solve/root/zero functions? - Helge Gabert - 09-07-2015, 09:28 PM RE: What's the difference in all the polynomial solve/root/zero functions? - parisse - 09-08-2015, 06:11 AM

User(s) browsing this thread: 1 Guest(s)