[BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`

12192016, 04:15 AM
Post: #1




[BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`
I was reading this post in another forum http://forum.hpprime.de/showthread.php?tid=183
and can confirm that all of the following result in the wrong root 0 on the Prime: zeros(x^4  3x^3  2.75x^2 + 12x  5) solve(x^4  3x^3  2.75x^2 + 12x  5 = 0) fsolve(x^4  3x^3  2.75x^2 + 12x  5 = 0) > [2.5, 2., 2., 0] The correct result would be: > [2.5, 2., 2., 0.5] Firmware version: 2016 08 29 (10637) The same commands work correctly with giac 1.2.2. Also, the exact version works on the Prime: zeros(x^4  3x^3  (275/100)*x^2 + 12x  5) > [2, 2, 5/2, 1/2] This looks more significant than a small rounding error. 

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Messages In This Thread 
[BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  danielmewes  12192016 04:15 AM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  danielmewes  12192016, 07:53 AM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  parisse  12192016, 04:37 PM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  Jan_D  12192016, 06:47 PM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  danielmewes  12202016, 03:18 AM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  Jan_D  12202016, 01:14 PM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`  toml_12953  12202016, 01:54 PM

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