meaning of pc in princomp of matlab

2014 9 14
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更新时间：2014 9 15
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Hi,
I am doing PCA using Matlab. In theory i studied that, the principal components are the eigen vector of the covarince matrix. I run the command (W,pc)=princomp(x) to do the same. But i did not understand what is pc and W here. I checked out that, pc here is not the eigen vector of the covariance matrix of the x. Can you pls explain what is pc here and how mathematically it could be found?
Thanks in advance :)

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