[Octave-bug-tracker] [bug #59636] iqr function does not produce Matlab compatible output

[Nicholas Jankowski]

URL:
  <https://savannah.gnu.org/bugs/?59636>

                 Summary: iqr function does not produce Matlab compatible
output
                 Project: GNU Octave
            Submitted by: nrjank
            Submitted on: Mon 07 Dec 2020 05:30:03 PM EST
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Nicholas Jankowski
        Originator Email: 
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: Any

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Details:

iqr includes some input options that Octave does yet support (the "all" flag,
an array for 'dim', probability distribution inputs).  but even apart from
those,  the output on regular data appears not to match when there's an even
number for median.  (note that median matches, so it's not an error stemming
from that).

Eg:


>> X = reshape(1:12,[3 4])

X =

     1     4     7    10
     2     5     8    11
     3     6     9    12

>> median(X)

ans =

     2     5     8    11

>> median(X,2)

ans =

    5.5000
    6.5000
    7.5000

>> iqr(X)

ans =

    1.5000    1.5000    1.5000    1.5000

>> iqr(X,2)

ans =

     6
     6
     6



and in Octave 5.2.0


>> X = reshape(1:12,[3 4])
X =

    1    4    7   10
    2    5    8   11
    3    6    9   12

>> median(X)
ans =

    2    5    8   11

>> median(X,2)
ans =

   5.5000
   6.5000
   7.5000

>> iqr(X)
ans =

   2   2   2   2

>> iqr(X,2)
ans =

   6
   6
   6







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