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[Octave-bug-tracker] [bug #59150] Parse error when concatenating strings


From: Rik
Subject: [Octave-bug-tracker] [bug #59150] Parse error when concatenating strings from multiple lines
Date: Mon, 21 Sep 2020 19:54:39 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36

Follow-up Comment #4, bug #59150 (project octave):

I think Matlab is also flummoxed, but that Octave should probably treat
continuation as equivalent to " ...".

In Matlab, matrix concatenation with character vectors acts as though there
was a space.  The motivating example produces


T = [...
'A'...
'B']
T = 'AB'


If the line continuation replaced the newline and added a space the new code
would be


T = [ 'A' 'B']


which on Octave would also produce the row string vector 'AB'.

To test my understanding, I tried using a comma as the joining character and
it works both ways.


T = [...
'A'...
,'B']
T = 'AB'


OR


T = [...
'A',...
'B']


The second case illustrates that it isn't a continuation operator followed
immediately by a character that is the problem.

Also, here's another example that doesn't use strings but that doesn't
concatenate properly in Octave.


T = [...
{1}...
{2}]



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