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Re:Principal component analysis: pictures, code and proofs (... by whytaka on Monday March 11, 2019 @04:10AM (#19357406)
I just read this today. You may find it helpful.

http://setosa.io/ev/principal-component-analysis/

Re:Principal component analysis: pictures, code and proofs (... by pepper_sauce on Monday March 11, 2019 @05:58AM (#19357771)
A similar example (using the popular Iris dataset):

https://www.math.umd.edu/~petersd/666/html/iris_pca.html