Why am I unable to delete an annotation using an empty string in SIMULINK 6.3 (R14SP3)?

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MathWorks Support Team 2009-6-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95294-why-am-i-unable-to-delete-an-annotation-using-an-empty-string-in-simulink-6-3-r14sp3

When I try to delete annotations by first getting the handle of the annotation and then setting the "Text" to the empty string by referring to the documentation Section 'Creating Annotations Programmatically',

h = find_system('test', 'FindAll', 'on', 'Type', 'annotation');
set_param(h, 'Name', '');

I receive the following warning and the annotation is not deleted, although the documentation still advocates this method:

Warning: You cannot set an annotation name to an empty string.

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Answer 1

MathWorks Support Team 2009-6-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95294-why-am-i-unable-to-delete-an-annotation-using-an-empty-string-in-simulink-6-3-r14sp3#answer_104646

In releases before Simulink 6.5, there is an error in the documentation for deleting annotations under 'Creating Annotations Programmatically'. The documentation should read as follows:

To delete an annotation, use the find_system command to get the annotation's handle and then use DELETE function for e.g.,

delete(find_system(gcs, 'FindAll', 'on', 'type', 'annotation'));