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

Asked by Mohamed Moawed

Mohamed Moawed (view profile)

on 3 Jun 2013
Latest activity Answered by Canadry Stinson

Canadry Stinson (view profile)

on 26 Nov 2013

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

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Mohamed Moawed

Mohamed Moawed (view profile)

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2 Answers

Answer by Tom Lane

Tom Lane (view profile)

on 3 Jun 2013
Edited by Tom Lane

Tom Lane (view profile)

on 6 Jun 2013
Accepted answer

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.

2 Comments

Mohamed Moawed

Mohamed Moawed (view profile)

on 4 Jun 2013

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 (view profile)

on 5 Jun 2013

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

Tom Lane

Tom Lane (view profile)

Answer by Canadry Stinson

Canadry Stinson (view profile)

on 26 Nov 2013

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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Canadry Stinson

Canadry Stinson (view profile)

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