Does `imshow` just delete all other objects in the axes?

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Albert Bing 2020-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/655813-does-imshow-just-delete-all-other-objects-in-the-axes

编辑： Mario Malic 2020-11-21

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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Albert Bing 2020-11-21

编辑：Albert Bing 2020-11-21

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'.

Mario Malic 2020-11-21