The Hilbert-transform is a phase shifter, which represents the complex complement
to a real vauled signal. It is calculated in the complex frequency space of the
signal by using the Fourier transform. Finally, calculating *f = y + i*H(y)*
gives the analytic signal, with a one sided spectrum. (See `analyticFunction`

)

1 | ```
H(x)
``` |

`x` |
real valued time series |

A numeric real valued vector is returned

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