[Octave-bug-tracker] [bug #48235] ver.m does not output an empty struct for an unknown package

[Garrett Euler]

URL:
  <http://savannah.gnu.org/bugs/?48235>

                 Summary: ver.m does not output an empty struct for an unknown
package
                 Project: GNU Octave
            Submitted by: ggeuler
            Submitted on: Wed 15 Jun 2016 06:05:06 PM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.2
        Operating System: Any

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Details:

In Octave 3.8.2- calling ver.m on an unknown package produced an empty struct
- which is what ver.m does in Matlab too.  Octave stable (4.0.2) & dev now
produce a scalar struct with empty fields which is not compatible with
previous Octave and Matlab.

As an example, this makes testing for a missing package go from:

if(isempty(ver('mypackage')))

to:

mypkg=ver('mypackage');
if(isempty(mypkg) || isempty(mypkg.Version))


I have attached a small patch to fix the issue (affects a single command
within ver.m and adds a test).



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File Attachments:


-------------------------------------------------------
Date: Wed 15 Jun 2016 06:05:06 PM GMT  Name: octave4_ver.diff  Size: 1kB   By:
ggeuler

<http://savannah.gnu.org/bugs/download.php?file_id=37492>

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