[Octave-bug-tracker] [bug #61690] Behavior of sum() with empty inputs

[Sarrah Bastawala]

Follow-up Comment #11, bug #61690 (project octave):

[comment #10 comment #10:]
> it's worth checking that the tests in those other functions do still match
matlab output. 

I have now crosschecked all provided tests in the data.cc file for relevant
functions such as cumprod, cumsum, prod and sum, and also added some extra
tests that work against both Octave and Matlab. The only function now
remaining slightly incompatible with Matlab is dot, and I believe that should
be addressed in bug #51333 as the changes would have to be made to a seperate
file.

Here are some examples of how my change fixes the bug :

octave:1> sum([])
ans = 0
octave:2> sum([],1)
ans = [](1x0)
octave:3> sum([],2)
ans = [](0x1)
octave:4> prod([])
ans = 1
octave:5> prod([],1)
ans = [](1x0)
octave:6> prod([],2)
ans = [](0x1)
octave:7> sum(ones(3,0),2)
ans =

   0
   0
   0

octave:8> sum(ones(1,0),1)
ans = [](1x0)
octave:9> sum(ones(3,0,4,2))
ans = [](1x0x4x2)


All of these are consistent with Matlab.


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