For given Frequency Domain Operator `S`

computes ratio `S^{-1}`

at each frequency.

1 | ```
freqdom.inverse(S, n = NULL, Kconst = NULL, K = NULL)
``` |

`S` |
first spectral density |

`n` |
number of observations used for estimation - the precision of inversion is calculated using this parameter |

`Kconst` |
constant for heuristic (as in |

`K` |
how many directions should be inverted (as in |

Frequency Domain Operator object

`freqdom.product`

, `freqdom.ratio`

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