Compute contrasts of chains of joint empirical distributions. For internal use.

1 | ```
CCDiff.default(x, cmat)
``` |

`x` |
an N times K matrix with numeric entries |

`cmat` |
a contrast matrix with K columns |

Denote the elements of `x`

by *x[n,k]* and denote the elements of `cmat`

by
*c[m,k]*. Function `CCDiff.default`

simply calculates:

*sum(k=1,..,K; m; n)(c[m,k]*x[n,k])*

for each m=1,...,M and n=1,...,N. The result is a N times M matrix.

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