[Octave-bug-tracker] [bug #52542] Weird behaviour of vertical concatenation with empty char array

[Luis Mendo]

URL:
  <http://savannah.gnu.org/bugs/?52542>

                 Summary: Weird behaviour of vertical concatenation with empty
char array
                 Project: GNU Octave
            Submitted by: lmendo
            Submitted on: Mon 27 Nov 2017 11:57:39 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Luis Mendo
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Any

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Details:

These three lines should give the same:


double([ones(1,0); 'A'])
double([char(ones(1,0)); 'A'])
double(vertcat(char(ones(1,0)), 'A'))


However, the results are respectively


ans =  65
ans =

   65
   32

ans =  65


(or see it online in this link:
https://tio.run/##y08uSSxL/f8/Jb80KSdVIzo/L7VYw1DHQNNaQd1RPVaTCyaRnJFYpAGXRZcuSy0qSU4s0UBTpQNSpan5/z8A)

How does that space (character 32) crawl in at the end of the second result?

The output in Matlab R2017a is just `65` in all three cases.




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