[Octave-bug-tracker] [bug #39838] str2double ('') gives [](0x1) instead of NaN

[anonymous]

Follow-up Comment #1, bug #39838 (project octave):

The behavior that `str2double({})` ==> `[]` is actually correct.  The
rationale being that you have given a cell array containing no strings to
convert, and that you should therefore get a list of no numbers in response.

Arguably, the `str2double('')` case is also documented to return an empty
value,  since rows of a matrix are documented as being interpreted separately,
and the empty string is 0x0 so has no rows.  Note that
`str2double(char(zeros(n,0)))` gives `nan(n,1)` in octave.  However, as you
observe, this differs from MATLAB's behavior, which is to return a single NaN
for any empty string (i.e. anything with a zero dimension).

MATLAB's behavior also differs on _any_ input that is not of char or cell
type; octave returns `nan(size(input))`, while matlab returns `nan(1)`.

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