Fast Fourier Transformation of a free decay

Hello, I have this graph of the free decay and I want to apply fast Fourier transformation

The only data I have are the 2 columns needed to generate this plot. How can i apply fft on this and then plot it?

Thanks in advance.

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/matlab/ref/fft.html