Computes the correlation matrix distance between two correlation matrices

1 | ```
cmd(x, y)
``` |

`x` |
First correlation matrix |

`y` |
Second correlation matrix |

Returns the correlation matrix distance, which is a value between 0 and 1. The correlation matrix distance becomes zero for equal correlation matrices and unity if they differ to a maximum extent.

Claus Ekstrom claus@rprimer.dk

Herdin, M., and Czink, N., and Ozcelik, H., and Bonek, E. (2005). *Correlation matrix distance, a meaningful measure for
evaluation of non-stationary mimo channels*. IEEE VTC.

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