Description Usage Arguments Details Value Author(s) References Examples

Stand-alone function to compute the inner product in the Hilbert space of U-centered distance matrices, as in the definition of partial distance covariance.

1 | ```
U_product(U, V)
``` |

`U` |
U-centered distance matrix |

`V` |
U-centered distance matrix |

Note that `pdcor`

, etc. functions include the centering and
projection operations, so that these stand alone versions are not
needed except in case one wants to check the internal computations.

Exported from U_product.cpp.

`U_product`

returns the inner product, a scalar.

Maria L. Rizzo mrizzo @ bgsu.edu and Gabor J. Szekely

Szekely, G.J. and Rizzo, M.L. (2014),
Partial Distance Correlation with Methods for Dissimilarities,
*Annals of Statistics*, Vol. 42, No. 6, pp. 2382-2412.

https://projecteuclid.org/euclid.aos/1413810731

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