Compute a kronecker product of two spectral densities

For given spectral densities `S`

and `SC`

computes product `S %*% SC`

at each frequency.

1 | ```
freqdom.product(S, SC)
``` |

`S` |
first spectral density |

`SC` |
second spectral density |

Frequency Domain Operator object

`freqdom.inverse`

, `freqdom.ratio`

1 2 3 4 5 6 | ```
n = 100
X = rar(n)
Y = rar(n)
SX = spectral.density(X)
SY = spectral.density(Y)
R = freqdom.product(SY,SX)
``` |

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