[Octave-bug-tracker] [bug #30509] 'imshow' doesn't reverse 'ydir' of axis

[Rik]

Follow-up Comment #4, bug #30509 (project octave):

I think we're getting closer to understanding, and hence finding a solution.

Currently, this sequence doesn't work with Matlab
plot;
hold on
imshow

When you do the reverse
imshow('arrow_up.jpg');
hold on;
plot(1:100,'c');

does Matlab
1) produce the line correctly from the lower left to the upper right?  With
'ydir' reversed I believe the line will also be incorrectly reversed and
travels from the upper left to lower right.

2) Assuming Matlab correctly plots part (1), does it do so by creating two
axes for the current plot?
children = get(gcf, "children");
get(children, "type")

which might return
ans =

{
  [1,1] = axes
  [2,1] = axes
}

3) If there is only one axis in part (2), and ydir is reversed, has Matlab
reversed the ydata manually?

handles = get(gca);
get(handles, 'ydata')

which I would expect to be 100:-1:1.

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