Plot time domain frequency graph
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Hello there! I have data from oscillator. It consists of 18000000 dots and looks like the graph from picture I've attached here. I need to plot time domain frequency graph, but because of oscillations I can't use 'findpeaks' or finding zeroes to calculate a period. How can I find a frequency and plot it in time domain?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/171591/image.jpeg)
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