Sorry it was my carelessness. The point is the 'NextPlot' property of the axes. The default value is 'replace'. So to make the previous defined handles kept, it should be changed to 'add'.
Does `imshow` just delete all other objects in the axes?
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It seems that imshow just deletes all other objects or handles in the parenting axes. Say I have a script like this
fig = figure;
ax = axes(fig);
text(ax, 0.5, 0.5, 'string');
h0 = findobj(ax, 'Type', 'text');
img = randn(128, 128);
imshow(img); % why is `imshow(ax, img)` illegal?
h = findobj(ax, 'Type', 'text');
h0 is a 1x1 text, but h is empty!
Another wierd behaviour of imshow is that you cannot set the axes in the imshow command, i.e. imshow(ax, img) is not allowed.
Why is imshow so different?
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Mario Malic
2020년 11월 21일
Hello,
To use hold on with handles to axes, this works.
hold(ax, 'on');
To assign image to axes with imshow
imshow(img, 'Parent', ax)
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