[Octave-bug-tracker] [bug #56062] Strange result solving a simple problem

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?56062>

                 Summary: Strange result solving a simple problem
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 02 Apr 2019 08:12:32 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.2
        Operating System: GNU/Linux

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Details:

Solving this problem gives very strange results:
https://www.youtube.com/watch?v=II61QgawnYQ

Can such a big difference be due to rounding errors?

>> format long;(8+3*sqrt(21))^(1/3)+(8-3*sqrt(21))^(1/3)
ans =  3.68693177121688 + 1.55130078140622i
>> format long;(8+3*sqrt(21))^(1/3)+-abs(8-3*sqrt(21))^(1/3)
ans =  1




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  <https://savannah.gnu.org/bugs/?56062>

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