[Octave-bug-tracker] [bug #51437] mean(zeros(1, 0)) does not return NaN for Matlab compatibility

[Reimund Renner]

Follow-up Comment #3, bug #51437 (project octave):

Here's a complete list up to dimesion three for mean(zeros(i,j,k), dim) and
last for mean(zeros(i,j,k)) without dim:

i j k dim ret
0 0 0  1  1×0×0
0 0 1     1×0
0 1 0     1×1×0
0 1 1     NaN
1 0 0     1×0×0
1 0 1     1×0
1 1 0     1×1×0
1 1 1     0

i j k dim ret
0 0 0  2  0×1×0
0 0 1     0x1
0 1 0     0×1×0
0 1 1     0x1
1 0 0     1x1x0
1 0 1     NaN
1 1 0     1x1x0
1 1 1     0

i j k dim ret
0 0 0  3  []
0 0 1     []
0 1 0     0x1
0 1 1     0x1
1 0 0     1x0
1 0 1     1x0
1 1 0     NaN
1 1 1     0

i j k dim ret
0 0 0     1x0x0
0 0 1     NaN
0 1 0     1x1x0
0 1 1     NaN
1 0 0     1x1x0
1 0 1     NaN
1 1 0     NaN
1 1 1     0

Hope this is useful.

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