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

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VBBV 2018-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/413612-how-can-i-check-if-the-axes-handles-exist-or-not

编辑： VBBV 2018-8-6

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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采纳的回答

Jan 2018-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/413612-how-can-i-check-if-the-axes-handles-exist-or-not#answer_331648

编辑：Jan 2018-8-5

在 MATLAB Online 中打开

See https://www.mathworks.com/help/matlab/graphics_transition/graphics-handles-are-now-objects-not-doubles.html#budq3t3

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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Jan 2018-8-5

编辑：Jan 2018-8-5

在 MATLAB Online 中打开

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.

VBBV 2018-8-6

编辑：VBBV 2018-8-6

@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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