[Octave-bug-tracker] [bug #58334] pdist2 giving wrong distances

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?58334>

                 Summary: pdist2 giving wrong distances
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 08 May 2020 11:50:12 AM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: address@hidden
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

A small example:


X = [0.25016   0.40176   0.18690
   0.48684   0.67867   0.55511
   0.35095   0.43696   0.26798
   0.48223   0.58751   0.90527
   0.60076   0.11600   0.12838
   0.78479   0.88859   0.55260
   0.48078   0.27091   0.81413
   0.30470   0.91434   0.88039
   0.76428   0.14590   0.59941
   0.62366   0.59127   0.85512]

Y = [0.774411   0.429394   0.546792
   0.143279   0.040654   0.502580
   0.076307   0.342643   0.750640
   0.961380   0.782662   0.666286
   0.922622   0.783488   0.466200]
   
D = pdist2(X, Y)


Correct result from Matlab:


D =

  Columns 1 through 3

         0.636494305254179         0.491401011188418        
0.592893306504636
         0.380663622297955         0.726538352653871        
0.565405579843355
         0.507062712315745          0.50519585298872         
0.56328070225954
         0.488750327571246         0.759011529054072        
0.498641922142533
         0.550853039186497         0.595811652350808        
0.844763580096822
         0.459350000458256          1.06444061535484        
0.916092860848724
         0.427558123137662         0.513797774457033        
0.415662135776161
         0.753052901223413         0.965465878183688        
0.629154897269345
         0.288513672329406         0.637255844553033        
0.731358441311782
         0.379467862883011          0.81131272405713        
0.610185842295607

  Columns 4 through 5

         0.938472780106061         0.822149559038987
         0.498359960911789         0.456943927356519
         0.806710807749593         0.697267307973061
         0.569896813344311         0.652023738101612
         0.929423408076212         0.814406366372464
         0.235221758942492         0.193672534521548
         0.717442902146227         0.760930906159028
         0.703141693330725         0.755316622409437
         0.669915408107621         0.670324959111624
         0.431675776040305         0.526863173288853


Wrong result from pdist2 (statistics package):


D =

   0.00000   0.09657   0.00000   0.53190   0.40468
   0.00000   0.62852   0.24792   0.00000   0.00000
   0.18624   0.28602   0.18322   0.59750   0.50986
   0.91063   0.95838   0.95890   1.09129   1.07915
   0.99667   0.69867   0.85966   1.29805   1.20277
   0.58019   1.06320   1.02563   0.61461   0.60706
   0.71440   0.56953   0.45477   0.96065   0.98533
   0.00000   0.87073   0.55589   0.00000   0.00000
   0.28851   0.63726   0.73136   0.66992   0.67032
   0.37947   0.81131   0.61019   0.43168   0.52686





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