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[Octave-bug-tracker] [bug #53199] hist returns different results dependi


From: jsh
Subject: [Octave-bug-tracker] [bug #53199] hist returns different results depending on 2nd 1:n/n input argument
Date: Wed, 21 Feb 2018 01:17:02 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0

URL:
  <http://savannah.gnu.org/bugs/?53199>

                 Summary: hist returns different results depending on 2nd
1:n/n input argument
                 Project: GNU Octave
            Submitted by: jsh
            Submitted on: Wed 21 Feb 2018 06:17:00 AM 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
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Any

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Details:

In this case below hist returns different results depending if the second
argument is 'n' or '1:n' where n is the number of count boxes. Specifically,
if only the 'n' argument is supplied then the a=15 count is missing.


a = [  1,  2,  3,  4, 0;
       5,  4,  6,  7, 8;
       9, 12, 11, 10, 0;
      13, 16, 15, 14, 0;
      17, 20, 19, 18, 0;
      21, 22, 23,  2, 0;
      24, 27, 26, 25, 0;
      28, 31, 30, 29, 0;
      32, 35, 34, 33, 0;
      36, 39, 38, 37, 0;
      40, 43, 42, 41, 0;
      44, 47, 46, 45, 0;
      48, 51, 50, 49, 0;
      52, 55, 54, 53, 0];

n = max(a(:));
cnt1 = hist( a(:), 1:n )
cnt2 = hist( a(:),   n )
cnt1 - cnt2
assert( isequal(cnt1,cnt2) )





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