[Octave-bug-tracker] [bug #47909] load and += does not add

[Rik]

Update of bug #47909 (project octave):

                Severity:              3 - Normal => 4 - Important          
                  Status:                    None => Confirmed              
                 Release:                   3.8.2 => dev                    
                 Summary: load and += doesnot add => load and += does not add

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Follow-up Comment #1:

Confirmed.  This bug exists for the current stable version of Octave (4.0.2)
as well as on the development branch.

The bug is not specific to the file format used to save the variable 'a'.  I
have used Octave's own binary and text formats and the errors are the same. 
The bug is specific to executing the lines within an m-file.  I have tried
both the original file, which is actually just a script.  I have also tried
wrapping the script lines within function/endfunction and calling b42(), but
that fails as well.

The error on line 2 comes from using the in-place += operator.  If I use the
line


a = a + 1;


then the code also works.  It would appear that the row/column indices for the
+= operation are not being generated correctly because on the development
branch I get the slightly more informative error


error: a(61,_): but a has size 10x10


It is clear that Octave knows the size is 10x10.


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