[Octave-bug-tracker] [bug #42034] legend () call should not create legend in some cases

[sergey plotnikov]

Follow-up Comment #3, bug #42034 (project octave):

Sorry, I should have provided more details on how I thought.

0 My assumption was that _legend ()_ is identical to _legend (gca)_, which is
not stated explicitly in the documentation, but is quite logical.
0 It was also logical to me (according to the quote I posted) that the empty
legend_handle as an output of _legend (...)_ command may appear only if legend
was not created during that call.
0 Assuming there's a possibility of creating no legend during a call of
_legend (...)_ I tried to come up with a proper inputs (instead of dots) which
could cause such a behavior.
0 _legend (<labels>)_ as well as _legend ("show")_ or _legend ("toggle")_ must
create some legend for sure (confirmed)
0 so the list of possible commands (I guessed) was

lh = legend ("hide");
lh = legend ("boxon");
lh = legend ("boxoff");
lh = legend ("off");
lh = legend (); % as a simplest possible case
lh = legend ("location","northeast");
lh = legend ("orientation","vertical");


Being tested in Matlab just last two commands created a legend with default
set of labels ("data1", "data2", ...), all the other displayed no legend and
returned [].

@Rik:
So, the first case resulted in hl = [] and no legend displayed and the second
one created legend with default labels.

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