[Octave-bug-tracker] [bug #48408] Changing a variable and saving file with -append in Octave makes it impossible to load a particular variable in MATLAB

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?48408>

                 Summary: Changing a variable and saving file with -append in
Octave makes it impossible to load a particular variable in MATLAB
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 05 Jul 2016 12:26:43 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.3
        Operating System: Microsoft Windows

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Details:

In MATLAB R2015a (under Ubuntu 12.04) I created a mat file so that I could
read it in Octave:
>> a=1;
>> save('datafile.mat', 'a', '-v7');

I then created a matrix and added it to the file:
>> b=zeros(2,2);
>> save('datafile.mat', 'b', '-append', '-v7');

In Octave 4.0.3 I loaded the file, changed the contents of b and saved the
modified version to file.
load('datafile.mat');
> b(1,1)=1;
> save('datafile.mat', 'b', '-append', '-v7');

Back in MATLAB, I tried to load the variable from the file:
>> load('datafile.mat', 'b')
>> b
b =
     0     0
     0     0

It loads the first version of b.
If I load the full file, it loads correctly:
>> load('datafile.mat')
>> b
b =
     1     0
     0     0

Of course, one might argue that this is a MATLAB bug, but the same code in
MATLAB produces the correct result.




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