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Removing the inner color of the ellipse in PCA

Time:12-15

Does anyone know how to change the transparency(or alpha) of the color in the ellipse?
I want to remain only the line of boundary in the plot.
I tried to mimic the code in this site: enter image description here

CodePudding user response:

You may use ellipse.alpha argument that can find enter image description here

(I forgot to set seed. Sorry...)

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