[Octave-bug-tracker] [bug #46015] Octave has rounding error that Matlab does not

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?46015>

                 Summary: Octave has rounding error that Matlab does not
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Mon 21 Sep 2015 09:29:54 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Bradlee Speice
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.1
        Operating System: Any

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Details:

So I have a pretty straightforward issue. The following equation produces
different results between Octave and Matlab:

100 * .998 * 1.009 * .998

Octave produces a result of 100.50
Matlab produces a (correct) result of 100.4968.

I'm guessing the rounding error appears in between multiplications, but it
seems strange that Octave would have this issue, no other calculator I tried
had the same problem.

Do I need to set the session precision higher or similar? I find that this
behavior as a default is an issue.




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