[Octave-bug-tracker] [bug #56167] non-existent cell indexing within matrix brackets results in concatenation error

[Rik]

Update of bug #56167 (project octave):

                Severity:              3 - Normal => 2 - Minor              
                Priority:              5 - Normal => 3 - Low                
                  Status:                    None => Confirmed              
                 Release:                   4.4.1 => dev                    
        Operating System:       Microsoft Windows => Any                    
                 Summary: pseudocode  [ { [](0x1) [](0x1) [](0x1) 1 }{}, 1 ]
fails,  [ 1 ,{ [](0x1) [](0x1) 1 }{}, 1 ] works => non-existent cell indexing
within matrix brackets results in concatenation error

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Follow-up Comment #4:

Confirmed.  I have re-titled the bug report to describe what I believe is the
error.

Note, this code does not run under Matlab.  Attempting to run this section


tmp{1} = 1;
tmp{2} = ones(3)(logical(zeros(3)));
tmp{3} = ones(3)(logical(zeros(3)));
tmp{4} = 1;
[tmp{}]


results in an error at the last line about an invalid expression.  In fact,
any indexing without an actual index is an error in Matlab.  For example,


tmp{}


So, one choice would be to make Octave compatible with Matlab and error for
this usage.  Currently, Octave appears to treat no index as the equivalent of
the magic colon ':' index.


tmp{} === tmp{:}


A reduced bit of code to reproduce the error message is


tmp = { zeros(0,1), zeros(0,1), 1 };
[tmp{}]




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