How to show principal component axis next to the original axis in IRIS data?

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farshad jahangiri 2022년 12월 21일

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https://kr.mathworks.com/matlabcentral/answers/1882337-how-to-show-principal-component-axis-next-to-the-original-axis-in-iris-data

댓글: farshad jahangiri 2022년 12월 23일

Hello I want to show principal component axis next to original axis (before rotation) in iris dataset for first 2 dimension but I don't know how. I attached an example photo. also my question is "What determines the magnitude of the principal component axis?"

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Image Analyst 2022년 12월 21일

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https://kr.mathworks.com/matlabcentral/answers/1882337-how-to-show-principal-component-axis-next-to-the-original-axis-in-iris-data#answer_1133417

See attached demos

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farshad jahangiri 2022년 12월 22일

Thanks a lot it was very helpful for me.

farshad jahangiri 2022년 12월 23일

Hi again.I changed this code to 2 dimensionam Because in the 3D mode, I suspected that the axes of the PCs are not perpendicular to each other, and when I drew in the 2D mode, I observed that they are not perpendicular to each other. As you know, the axes of the PCs must be perpendicular to each other. can you help me ? @Image Analyst