[BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`
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12-19-2016, 04:15 AM
Post: #1
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[BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve`
I was reading this post in another forum http://forum.hp-prime.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 - 12-19-2016 04:15 AM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve` - danielmewes - 12-19-2016, 07:53 AM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve` - parisse - 12-19-2016, 04:37 PM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve` - Jan_D - 12-19-2016, 06:47 PM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve` - danielmewes - 12-20-2016, 03:18 AM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve` - Jan_D - 12-20-2016, 01:14 PM
RE: [BUG?] Wrong numeric result with CAS `fsolve`/`zeros`/`solve` - toml_12953 - 12-20-2016, 01:54 PM
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