I've actually used octave today for some real work so I hit a few bugs:
*) The axis when showing images isn't correct. This was fixed in
previous version after some discussions on the behaviour. I think you
just have to flip the y-axis. The problem can be illustrated by the
following code:
im = zeros(50, 50);
im(30, 5:15) = 1;
im(25:35, 10) = 1;
imshow(im)
hold on; plot(10, 30, 'r*'); hold off
This should show a black image with a white cross. In the center of the
white cross a red * should appear.
*) The "pause" function should call drawnow.
*) The "text" function doesn't do anything on my system.
I think that was all the problems I found,
Søren