Common tangents in a symmetric triple well function

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Haiying Yang 2022-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/1633725-common-tangents-in-a-symmetric-triple-well-function

关闭： John D'Errico 2022-1-22

Dear Sir/Madam,

I have a problem about finding the common tangents of two local minima of a symmetric triple well function. The function is shown below:

The function is:

The following figures shows the common tangents I want to find out (drawn in the red line). I want to find out the common tangents near the specifc two local minima. Does anyone have any good idea?

PS: I also found a similar question about finding the common tangents and applied my function using that code, but that code only gives me other common tangents and cannot find out the common tangents I wanted here. The similar question link is here for your references:

https://www.mathworks.com/matlabcentral/answers/591076-common-tangent-of-double-well-function

How can I revise this code to find out the common tangents I wanted here?

Thank you very much.

Best regards,

Haiying