Problem with zeros, solve in CAS.
01-01-2014, 10:59 PM
Post: #1
 John P Member Posts: 216 Joined: Dec 2013
Problem with zeros, solve in CAS.
When on HP Prime in CAS finding zeros or solving with solve for example x^2-100 I get only one solution 10 but it should be [-10,10] or {-10,10} or maybe I have to change something i setting. In Home view it seams to work OK.
Happy New Year 2014.
Thanks.
01-02-2014, 02:15 AM
Post: #2
 Michael de Estrada Senior Member Posts: 373 Joined: Dec 2013
RE: Problem with zeros, solve in CAS.
(01-01-2014 10:59 PM)John P Wrote:  When on HP Prime in CAS finding zeros or solving with solve for example x^2-100 I get only one solution 10 but it should be [-10,10] or {-10,10} or maybe I have to change something i setting. In Home view it seams to work OK.
Happy New Year 2014.
Thanks.

Please provide more details, such as the exact syntax you are using and your CAS settings. I don't have any problem getting the correct result on my Prime.
01-02-2014, 04:07 AM
Post: #3
 John P Member Posts: 216 Joined: Dec 2013
RE: Problem with zeros, solve in CAS.
(01-02-2014 02:15 AM)Michael de Estrada Wrote:
(01-01-2014 10:59 PM)John P Wrote:  When on HP Prime in CAS finding zeros or solving with solve for example x^2-100 I get only one solution 10 but it should be [-10,10] or {-10,10} or maybe I have to change something i setting. In Home view it seams to work OK.
Happy New Year 2014.
Thanks.

Please provide more details, such as the exact syntax you are using and your CAS settings. I don't have any problem getting the correct result on my Prime.

Here is the syntax:
solve(x^2-100=0,x) -> {-10}
zeros(x^2-100,x) -> [-10]
P.S. In the latest emulator I do not have this problem solve and zeroes return {-10,10}, [-10,10].

Settings in CAS:
Number Format: Standard, 4
Integers: Decimal
Simplify: Minimum
Exact: v
Use -v: v
Principal: v

Recursive Eval. 5
Rec. Repl. 1
Rec. Fn. 9
Epsilon: .000000000001
Prob. 1E-15
Newton 40
01-02-2014, 04:36 AM
Post: #4
 Michael de Estrada Senior Member Posts: 373 Joined: Dec 2013
RE: Problem with zeros, solve in CAS.
I don't see anything wrong, and my Prime gives the correct answer with your syntax. You didn't show your CAS settings for Complex, Use i and Increasing, however, those shouldn't affect your results.

Do you have the latest firmware (2013 11 25 (5447)) on your Prime ? Have you tried a hard reset using the pinhole at the rear of the calculator ?
01-02-2014, 05:16 AM
Post: #5
 John P Member Posts: 216 Joined: Dec 2013
RE: Problem with zeros, solve in CAS.
(01-02-2014 04:36 AM)Michael de Estrada Wrote:  I don't see anything wrong, and my Prime gives the correct answer with your syntax. You didn't show your CAS settings for Complex, Use i and Increasing, however, those shouldn't affect your results.

Do you have the latest firmware (2013 11 25 (5447)) on your Prime ? Have you tried a hard reset using the pinhole at the rear of the calculator ?

Yes, I do have the latest firmware. I was looking how to flash the memory and put the latest firmware again and accidentally I fixed the problem by pressing together the:
On+Apps+Esc for very short time and releasing them together. It seams to be working OK for now and I hope it stays like that.
Thanks Michael.
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