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Utility functions manipulating the core objects.

Not all use cases are handled by these utilities. You are encouraged to write your own functions for your specific use case. Feel free to share them with the community by opening an issue and/or a merge request if you think your function is general enough to be useful for others.

freq2time(...)	Convert frequency-domain representation or data to time-domain representation or data using the inverse real FFT.
time2freq(...)	Convert time-domain representation or data to frequency-domain representation or data using the real FFT.
time2wdm(...)	Transform a time series to WDM.
wdm2time(...)	Transform WDM expansion to equivalent time series.
wdm2freq(...)	Transform WDM expansion to a frequency series.
freq2wdm(...)	Transform frequency series to WDM.
xyz2aet(...)	Convert data, waveforms or spectral density matrices in XYZ channels to AET channels.
aet2xyz(...)	Convert data, waveforms or spectral density matrices in AET channels to XYZ channels.

Below are some general utility functions.

year2second(year)	Convert years to seconds.
month2second(month)	Convert months to seconds.
day2second(jday)	Alias for jday2second().
sday2second(sday)	Convert sidereal days to seconds.
jday2second(jday)	Convert Julian days to seconds.
week2second(week)	Convert weeks to seconds.
hour2second(hour)	Convert hours to seconds.
minute2second(minute)	Convert minutes to seconds.