[Octave-bug-tracker] [bug #56659] Symmetry of linspace (-a, a, n)

[Marco Caliari]

URL:
  <https://savannah.gnu.org/bugs/?56659>

                 Summary: Symmetry of linspace (-a, a, n)
                 Project: GNU Octave
            Submitted by: caliari
            Submitted on: Tue 23 Jul 2019 11:25:16 AM UTC
                Category: Octave Function
                Severity: 1 - Wish
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

If you generate a vector by


x = linspace (-1, 1, 11);


you discover that it is not symmetric


> x ==-fliplr (x)
ans =

  1  1  0  0  0  1  0  0  0  1  1


If you measure the difference you find


> max (abs (x + fliplr (x)))
ans =    2.2204e-16


(while it is eps/2 in matlab).
What about to correct by default the result by performing


x = (x - fliplr (x)) / 2;


at the end?




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