Frequency to Time domain conversion ?

I have a excel file of Frequency vs. Magnitude. How to convert into Time vs. Magnitude in Matlab & Simulink?

Answer 1

[Walter Roberson]

If the frequencies are equally spaced, then use ifft()

If the frequencies are not equally spaced, then see NFFT

[Arul Thm]

Sir, How to apply NFFT?

[Walter Roberson]

You would need to download the code from the above link and install it.

Other possible reading of interest:

http://www.cims.nyu.edu/cmcl/nufft/nufft.html

http://www.swmath.org/?term=nonequispaced%20fast%20Fourier%20transform

https://www.mathworks.com/matlabcentral/newsreader/view_thread/41005