[Octave-bug-tracker] [bug #60521] compatibility of strfind()

[John Beale]

URL:
  <https://savannah.gnu.org/bugs/?60521>

                 Summary: compatibility of strfind()
                 Project: GNU Octave
            Submitted by: jbeale
            Submitted on: Tue 04 May 2021 02:39:35 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

The Octave 6.2 implementation of strfind() is not compatible with  Matlab
R2021a, as described below. Matlab strfind() can work on type logical inputs,
which some published solutions rely on, and Octave fails unless it is type
char.

https://octave.discourse.group/t/find-start-index-of-group-of-nonzero-elements-in-vector/1113

Code demonstrating the problem of finding start/end indexes of groups of
non-zero elements (works in Matlab, but not Octave):

TestVec = [0 0 3 4 5 0 0 1 2 0 7 8 9];
mask = logical(TestVec);
starts = strfind([false, mask], [0 1]);
stops = strfind([mask, false], [1 0]);




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