[Octave-bug-tracker] [bug #57476] Numerical inaccuracy in range object

[Luis Mendo]

URL:
  <https://savannah.gnu.org/bugs/?57476>

                 Summary: Numerical inaccuracy in range object
                 Project: GNU Octave
            Submitted by: lmendo
            Submitted on: mié 25 dic 2019 12:10:57 UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Luis Mendo
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Any

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Details:

There seems to be some numerical accuracy issues with `range` objects.


x = 1:4; % typeinfo gives "range"
y = x.'.'; % typeinfo gives "matrix"
x==y % gives all true, as expected
1j.^x % gives INACCURATE result. Error is of the order of eps
1j.^y % gives the expected result


Tested in Octave 5.1 on Linux, and in Octave 4.2 on Linux and on Windows





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