[Octave-bug-tracker] [bug #51801] OO: constructor without arguments

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?51801>

                 Summary: OO: constructor without arguments 
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 20 Aug 2017 12:03:43 PM UTC
                Category: Documentation
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

In the manual, Section 34.1 we read: 

Ideally, even when the constructor is called with no arguments 
it should return a valid object. 


That is too weak. 
Say, the class has name pn, then pn() defines the default value. 
Default values are known (yet not mentioned in the documentation) 
for primitive types: 
As a consequence, writing a(3,3)=1 fills up a with zeros: 
a = 
   0   0   0
   0   0   0
   0   0   1
Along the same lines, pn() is the default value 
and so a(3,3)=pn(1) 
yields 
a = 
   0   0   0
   0   0   0
   0   0   1
also, where the 1 is created by pn(1) 
and the 0 by pn() (not pn(0))! 




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