Hi,
I have almost no experience in mathematica or any coding language and after I have read "the introduction to dynamics" I still cannot solve the problem. It feels like that I need knowledge of the mathematica language logic but I have no idea what I shall read. I hope you guys can give me a hint. Any help is appreciated.
The Goal of the code: Read the image. Interactively chose a square area then the code shows the intensity distribution of the encircled area with listplot3D.
The problem is that the plot did not show up, but subimage$$ instead. Looks like this is just a labeling of variable?
The code I tried is attached. Thanks a lot!
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