[Octave-bug-tracker] [bug #43302] old-style class support, difference with matlab

[Colin Macdonald]

URL:
  <http://savannah.gnu.org/bugs/?43302>

                 Summary: old-style class support, difference with matlab
                 Project: GNU Octave
            Submitted by: cbm
            Submitted on: Fri 26 Sep 2014 09:16:39 AM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  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:

Somestimes classes written in Octave that work in Octave don't work in Matlab.
 Probably fixing such things is not a high priority for us, compared to the
other way around!

But anyway, here is one example.  Sorry don't have time at the moment to
prepare a proper test case but wanted to record this while I'm thinking about
it.
This works:


class A:
  <variables>
  value
  <methods>
  numel: 1
  subsref: written to give dot access to "value"


Now consider "x = A(10); x.value".  This works great, returns 10.

Now make class B, same except numel is 2 (or anything not 1).

"x = B(10); x.value".  In Octave this returns 10, which seems reasonable.

But Matlab would give an error in the B case.

There is a discussion here:

http://www.mathworks.com/matlabcentral/answers/101955-why-do-i-receive-errors-when-overloading-subsref-for-types-and-for-matlab-classes





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