[Octave-bug-tracker] [bug #48064] for-loop over structure elements behaves differently from document

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?48064>

                 Summary: for-loop over structure elements behaves differently
from document
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 31 May 2016 09:34:06 AM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Wang S
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.2
        Operating System: GNU/Linux

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Details:

PDF documentation says that
"The key variable may also be omitted. If it is, the brackets are also
optional."
in section 10.5.1 Looping Over Structure Elements, page 168.

But the behavior is as follow

octave:1> clear all; x.a=1; x.b=[1,2;3,4]; x.c="string"; for [val,key]=x, key,
val, endfor
key = a
val =  1
key = b
val =

   1   2
   3   4

key = c
val = string

OK

octave:2> clear all; x.a=1; x.b=[1,2;3,4]; x.c="string"; for [~,key]=x, key,
endfor
key = a
key = b
key = c

OK

octave:3> clear all; x.a=1; x.b=[1,2;3,4]; x.c="string"; for [val,~]=x, val,
endfor
val =  1
val =

   1   2
   3   4

val = string

OK

octave:4> clear all; x.a=1; x.b=[1,2;3,4]; x.c="string"; for [val]=x, val,
endfor
val =

  scalar structure containing the fields:

    a =  1
    b =

       1   2
       3   4

    c = string


cannot loop over elements

octave:5> clear all; x.a=1; x.b=[1,2;3,4]; x.c="string"; for val=x, val,
endfor
val =

  scalar structure containing the fields:

    a =  1
    b =

       1   2
       3   4

    c = string


cannot loop over elements

Which is correct, the behavior or the document?

System information:

octave:6> ver
----------------------------------------------------------------------
GNU Octave Version: 4.0.2
GNU Octave License: GNU General Public License
Operating System: Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2
(2016-04-08) x86_64

and Debian package status:

ii  liboctave3:amd64      4.0.2-1~bpo8+1 amd64
ii  octave                4.0.2-1~bpo8+1 amd64
ii  octave-common         4.0.2-1~bpo8+1 all
ii  octave-doc            4.0.2-1~bpo8+1 all
ii  octave-info           4.0.2-1~bpo8+1 all






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