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

2013 6 3
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Tom Lane
Tom Lane 2013-6-3
编辑：Tom Lane 2013-6-6

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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
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
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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Andrea Le
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.

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