How do I find the frequency of a signal?

I currently have an array of data points which is clearly damped oscillation just by looking at the graph, however how would i go about getting matlab to give me a readout of the frequencies.

I use findpeaks (link) to identify the peaks and their locations.Then, using by the location information to calculate the period and from that how can i go for frequency?

[pks,locs]=findpeaks(Accelaration);
natPeriod = diff(time_vector(locs));

freq. ??

[Walter Roberson]

abs(fft()) and look for a peak at approximately 7/4 Hz

[EYUP KARTAL]

thank you for your comment but i didnt get it. i tried to do in this way

for ii=1:length(natPeriod)
        omega(ii) = 2*pi/(natPeriod(ii));
end

and plots i get for non dimensional damping and frequency like below

but freq must be something like this:

[Anmol Dhiman]

Hi Eyup,

Have a look a similar ML Answer.

Regards,

Anmol Dhiman