[Octave-bug-tracker] [bug #53924] ismember error with mixed numeric and char arrays inputs

[Guillaume]

URL:
  <http://savannah.gnu.org/bugs/?53924>

                 Summary: ismember error with mixed numeric and char arrays
inputs
                 Project: GNU Octave
            Submitted by: gyom
            Submitted on: Wed 16 May 2018 11:03:42 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Guillaume
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Unusual corner case with ismember() but it highlights a difference between
Octave and Matlab.

In Octave:


octave> ismember([],'a')
error: Invalid call to lookup.  Correct usage is:
 -- IDX = lookup (TABLE, Y)
 -- IDX = lookup (TABLE, Y, OPT)
error: called from
    print_usage at line 91 column 5
    ismember at line 136 column 10


In Matlab:


>> ismember([],'a')
ans =
  0x0 empty logical array


Testing further, one also gets in Octave:


octave> ismember([],{'a'})
ans = [](0x0)


while Matlab gives an error:


>> ismember([],{'a'})
Error using cell/ismember (line 34)
Input A of class double and input B of class cell must be cell arrays of
character vectors, unless one is a
character vector.






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