Calculates principal components from a matrix

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`mat` |
a numeric matrix. |

`cent` |
a logical value referring to center argument in |

`scle` |
a logical value referring to scale argument in |

a list containing

`pcs` |
a matrix of principal component loadings |

`d` |
a matrix containing the singular value (eigenvalue) of each principal component on its diagonal |

`v` |
a matrix of eigenvectors |

R port by Chris Walsh cwalsh@unimelb.edu.au from S+ library by Glenn De'ath g.death@aims.gov.au.

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