what is the difference between pca(x) and princomp(x) matlab commands?

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Mohamed Moawed 2013-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/77820-what-is-the-difference-between-pca-x-and-princomp-x-matlab-commands

评论： Imad Ahmed Tungekar 2017-11-29

采纳的回答： Tom Lane

could any one help me the difference between pca(x) and princomp(x) matlab commands?

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Answer 1

Tom Lane 2013-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/77820-what-is-the-difference-between-pca-x-and-princomp-x-matlab-commands#answer_87595

编辑：Tom Lane 2013-6-6

If you type "type princomp" you will see that it is just a call to pca with certain default inputs defined. The pca function was introduced just in an attempt to have a more familiar name.

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Mohamed Moawed 2013-6-4

thanks for your reply. i want to ask is the input of the princomp is input matrix or covariance matrix? ans what about pca function is input matrix or covariance matrix?

Tom Lane 2013-6-5

编辑：Tom Lane 2013-6-6

Use pcacov if you have the covariance matrix. The others expect the data matrix.

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Answer 2

Andrea Le 2013-11-26

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Besides from what Tom said, I want to add other difference between these two commands princomp lets you decide to do an economic version of the outputs. pca automatically truncates your matrix into an economic version.