How to smooth signal and find dominant freqeuncy using FFT?

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Steven
Steven 2015-9-24
回答： Samudrala Jagadish 2015-9-27
Hi. I am not so familiar with signal processing. I have this oscillation which I like to find its dominant frequency. I used FFT, but it does not give me any specific value.
After all, can we define any frequency for this kind of oscillations? How can I smooth the data? I used filter and sgolayfilt, but they didn;t change the data at all.
Thanks in advance!
Steven

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Samudrala Jagadish
Samudrala Jagadish 2015-9-27
If you want to smooth the given signal without using FFT Filtering, they you may use a concept called "Moving Average Filter" Please follow my file exchange link as given below it contains a code to smooth a signal upto some extent
here is the link:
http://in.mathworks.com/matlabcentral/fileexchange/53241-signal-smoothing-or-moving-average-filter

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