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

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Albert Bing
Albert Bing on 21 Nov 2020
Edited: Mario Malic on 21 Nov 2020
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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Accepted Answer

Mario Malic
Mario Malic on 21 Nov 2020
To use hold on with handles to axes, this works.
hold(ax, 'on');
To assign image to axes with imshow
imshow(img, 'Parent', ax)
  1 Comment
Albert Bing
Albert Bing on 21 Nov 2020
I checked my other code, turned out the axes was used as axes(fig, 'NextPlot', 'add').
So I guess imshow is not so different.

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