I have time data for 10000 points. What is the optimum value of Nfft to view frequency spectrum using FFT in signal processing tool box ?

I have time data for 10000 points. What is the optimum value of Nfft to view frequency spectrum using FFT in signal processing tool box ?

Answer 1

[Image Analyst]

Study up on the Nyquist Frequency: https://en.wikipedia.org/wiki/Nyquist_frequency and Nyquist rate: https://en.wikipedia.org/wiki/Nyquist_rate

Answer 2

[Star Strider]

The NFFT can be anything greater than 10000 for your signal. The fft is most efficient if it has a vector with the length of a power-of-two to work with. The next highest power-of-two should work.

See the nextpow2 function.