[Octave-bug-tracker] [bug #33523] Matlab compatibility issue with averaging the 3rd dim of a 2-D array

[Michael Godfrey]

Follow-up Comment #7, bug #33523 (project octave):

This seems to be a reasonable request, and helps with
Matlab compatibility.  However, the behavior shown below
seems not to match the Matlab doc:

>> help mean
 MEAN   Average or mean value.
    For vectors, MEAN(X) is the mean value of the elements in X. For
    matrices, MEAN(X) is a row vector containing the mean value of
    each column.  For N-D arrays, MEAN(X) is the mean value of the
    elements along the first non-singleton dimension of X.
 
    MEAN(X,DIM) takes the mean along the dimension DIM of X. 
 
    Example: If X = [0 1 2
                     3 4 5]
 
    then mean(X,1) is [1.5 2.5 3.5] and mean(X,2) is [1
                                                      4]
 
    Class support for input X:
       float: double, single
=====================

Given this, what is the correct behavior for mean(X,3)?
Matlab says:
>> x = [ 0 1 2; 3 4 5]

x =

     0     1     2
     3     4     5

>> mean(x,2)

ans =

     1
     4

>> mean(x,3)

ans =

     0     1     2
     3     4     5

>> mean(x,4)

ans =

     0     1     2
     3     4     5

>
Should the documentation or the behavior be implemented?



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