Simplify a (Principal Component) Vector to a Simple Component

Reorder the columns of a component matrix `P`

by decreasing
variances of components where the block-components come first, the
difference components afterwards.

1 | ```
sortmatrix(S, P)
``` |

`S` |
correlation/covariance matrix |

`P` |
component matrix |

numeric matrix which is just `P`

with columns reordered.

`sca`

, also for references

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