how to save plot handle in an array and delete the plot later?

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roudan
roudan 2021-7-15
评论： Devanuj Deka 2021-7-16
Hi
In my plot, I have 10 plots. I am creating a 1D array using handle_array=zeros(10,1), then later I save ith plot's handle to the array using handle_array(i)=plot_handle. Later I'd like to delete the specific plot using delete(handle_array(ith)), and I got an error of annot access method 'delete' in class 'matlab.ui.Root'.
I found the data saved in the handle array is not a handle and it is just a number.
so how to save the plot handle and delete the plot later? Thanks for your help.

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Walter Roberson
Walter Roberson 2021-7-15
Ran in:
handle_array=zeros(10,1)
handle_array = 10×1
0 0 0 0 0 0 0 0 0 0
Do not do that for any modern version of matlab. Instead use
handle_array = gobjects(10,1)
handle_array =
10×1 GraphicsPlaceholder array: GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder GraphicsPlaceholder
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Walter Roberson
Walter Roberson 2021-7-15
isvalid() or ishghandle() or ishandle()
ishandle() returns true for java objects as well as hg objects, but ishghandle() returns false for java.
isvalid() returns false for uninitialized or deleted handles.
roudan
roudan 2021-7-15
Thank you Walter, ishandle() works perfectly! I appreicate your help. It saved me a lot of time! Have a great dat Sir!

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Devanuj Deka
Devanuj Deka 2021-7-15
编辑：Devanuj Deka 2021-7-15
I would suggest creating a cell array for handle_array. The function zeros(10,1) creates a 10x1 array of type 'double', which means you cannot store plot handles in it - it will store a numeric value instead of the plot handle.
With cell(sz1,...,szN) you can initialize an array with the same syntax as zeros(10,1), but you can store any data type in these individual cells.
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roudan
roudan 2021-7-16
Thanks Devanuj, yes I used (), using {} solved the problem. Thank you. I really appreciate your help.

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