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how can i check if the axes handles exist or not ?

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I have GUI which has several pushbuttons. The pushbutton create handles to axes. I want to check if the specific handle or set of handles exist and then write necessary code whether to delete the handle or not ? how can I do it?


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Accepted Answer

Jan on 5 Aug 2018
Edited: Jan on 5 Aug 2018
if isgraphics(handles.axes1)
In Matlab versions older than R2014b:
if ishghandle(handles.axes1)
I'd prefer ishghandle, because isgraphics accepts integer handles also, which is less reliable in my opinion.


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Image Analyst
Image Analyst on 5 Aug 2018
Where did you expect to plot it? Not in f1 since you deleted that axes. So it would plot in whatever now became the current axes. If there was no other axes left, it would have created one.
You can pass the axes handle into plot() you know.
Jan on 5 Aug 2018
It is not clear, what you expect ishandle(handle,'f1') to do. What is "handle"? Why do you expect ishandle to accept a second input argument called 'f1'? See: doc ishandle to see, that you do not use this command correctly. If it does not show an error, maybe you do not run the code at all?
Did you read my answer?
if isgraphics(handles.f1)
seems to be better.
Vasishta Bhargava
Vasishta Bhargava on 6 Aug 2018
@Jan, yeah, ishandle() function has only ONE input argument and also isgraphics() works better than ishandle() ... it works fine now. thanks for the solution.

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