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Hi Jiahong,

I like the given motivations for density-based clustering.

For Figure 9, I fail to see how DBSCAN can possibly output these clusterings. It looks to me that the points on the border separating the blue and green clusters should be "density-connected".

For the DENCLUE section, you mention hill climbing but not the function that is supposedly being maximized? Also, your only definition of $f$ is the distribution for $x_{1},\dots ,x_{n}$. Where is the function $f(\cdot )$ defined? (Unless $f_{h}$ is a typo.)

For Figure 6, can you explain what each diagram is showing? How is $h$ changed going from the middle to the right diagram?

What is the $d$ in the formula for $\nabla f(x)$? This also doesn't quite look like the derivative to $f_{h}$...

Ricky

Hi Ricky,

Thank you for pointing out some errors in my page, I am trying to correct them, I will read the paper and other resources again.

Best regards,

Jiahong Chen