[Octave-bug-tracker] [bug #49759] Inconsistent concatenation with cat, horzcat, vertcat, and []

[Mike Miller]

Follow-up Comment #4, bug #49759 (project octave):

I agree, I don't see any open reports about the *cat functions specifically.

The problem looks like it occurs when empty numeric arrays are converted into
cell arrays for concatenation. Any homogeneous set collapses correctly:


>> vertcat ({}, {}, {}, {}, {}, {})
ans = {}(0x0)
>> vertcat ([], [], [], [], [], [])
ans = [](0x0)


But as soon as a mixed set is introduced, it adds empty elements to a
non-empty cell array.


>> vertcat ({}, {}, {}, {}, {}, [])
ans = 
{
  [1,1] = [](0x0)
}


Amro - in Matlab, does the empty array have to be a double or can it be any
empty numeric? What does your original example do with "A = int32([])" or "A =
rand(0, 'single')"?

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