[Octave-bug-tracker] [bug #54052] the global statement clears previously assigned values

[Lars Kindermann]

URL:
  <http://savannah.gnu.org/bugs/?54052>

                 Summary: the global statement clears previously assigned
values
                 Project: GNU Octave
            Submitted by: larskindermann
            Submitted on: Mon 04 Jun 2018 07:23:35 AM UTC
                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: GNU/Linux

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Details:


>> a=1
a =  1
>> global a
>> a
a = [](0x0)
>>


Matlab will retain the previous value instead but issue a warning, according
to its documentation.

The Octave documentation does not specify what behaviour to expect.

In addition, I don't understand what the help 


>> help global

 -- global VAR
     Declare variables to have global scope.

          global X;
          if (isempty (X))
            x = 1;
          endif

     See also: persistent.

 
intents to explain. It would make some sense to me if the last x was
uppercase, too?




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