[Octave-bug-tracker] [bug #60643] struct disp and display

[Nicholas Jankowski]

URL:
  <https://savannah.gnu.org/bugs/?60643>

                 Summary: struct disp and display 
                 Project: GNU Octave
            Submitted by: nrjank
            Submitted on: Wed 19 May 2021 07:18:04 PM EDT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Nicholas Jankowski
        Originator Email: 
             Open/Closed: Open
                 Release: 6.2.0
         Discussion Lock: Any
        Operating System: Any

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Details:

Output from Matlab R2021a:

>> abc = struct("foo","def","bar",1)

abc = 

  struct with fields:

    foo: "def"
    bar: 1

>> display(abc)

abc = 

  struct with fields:

    foo: "def"
    bar: 1

>> disp(abc)
    foo: "def"
    bar: 1


with Octave 6.2.1 (hg id: 161daebce243)


>> abc = struct("foo","def","bar",1)
abc =

  scalar structure containing the fields:

    foo = def
    bar = 1

>> display(abc)
abc =

  scalar structure containing the fields:

    foo = def
    bar = 1

>> disp(abc)
  scalar structure containing the fields:

    foo = def
    bar = 1


the difference is disp, which still displays the object type and text for
Octave.  

This came up when trying to overload display for a matlab-octave compatible
class. here's a simple old class style example:


@MyClass/myClass.m:

function si = MyClass ()
  si = struct("foo","def","bar",1);
  si = class (si, 'MyClass');
end


with no display overloading:

Matlab:

>> A = MyClass

A = 

       MyClass object: 1-by-1

>> A

A = 

       MyClass object: 1-by-1

>> disp(A)
       MyClass object: 1-by-1

>> display(A)

A = 

       MyClass object: 1-by-1


Octave:

>> A = MyClass
A =

  <class MyClass>

>> A
A =

  <class MyClass>

>> disp(A)
  <class MyClass>
>> display(A)
A =

  <class MyClass>


adding the following display overloading:

function display (obj)
  disp(sprintf('%s object containing the properties:', class(obj)))
  disp(struct(obj))
end


Matlab:

>> A = MyClass
MyClass object containing the properties:
    foo: "def"
    bar: 1

>> A
MyClass object containing the properties:
    foo: "def"
    bar: 1

>> disp(A)
       MyClass object: 1-by-1

>> display(A)
MyClass object containing the properties:
    foo: "def"
    bar: 1


Octave:

疘>> A = MyClass
MyClass object containing the properties:
  scalar structure containing the fields:

    foo = def
    bar = 1
>> A
MyClass object containing the properties:
  scalar structure containing the fields:

    foo = def
    bar = 1
>> disp(A)
  <class MyClass>
>> display(A)
MyClass object containing the properties:
  scalar structure containing the fields:

    foo = def
    bar = 1





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