It is quite obvious that there is a major frequency component with a wavelength of about 30 x-units, but there are of course significant other frequencies. There is a gigantic DC offset, so the most dominant frequency is 0Hz from just looking at it.
To get frequencies, we first need to know all the units. Looks like you are just graphing with dt=1. Do you know the real point spacing?
If you are only interested in the major oscillation, maybe "extract single tone" would be all you need.
Sir is a graph of displacement of poker so i need to calculate frequency of every signal not only major oscillations.
So frequencies, not frequency then. Start by attaching some typical data.
1. Its a fraction of signal
2.frequency change over time
3.Data represent displacement
4.overall frequency of signal
5.poker is vibrator used in constructions,
6.im not interested in phase information