Difference Between 'fft(signal, nfft)' and 'fft(signal)'

1. What is the difference between NFFT and FFT?
2. What is Nfft FFT?
3. What does NFFT mean in Matlab?
4. What is the difference between DFT and FFT in Matlab?

What is the difference between NFFT and FFT?

NFFT can be any positive value, but FFT computations are typically much more efficient when the number of samples can be factored into small primes. Quoting from Matlab documentation: The execution time for fft depends on the length of the transform. It is fastest for powers of two.

What is Nfft FFT?

The non-equidistant fast Fourier transform (NFFT) is an extension of the famous fast Fourier transform (FFT), which can be applied to non-equidistantly sampled data in time/space or frequency domain.

What does NFFT mean in Matlab?

NFFT is one of the abbreviations used for Non-Uniform Fast Fourier Transform.

What is the difference between DFT and FFT in Matlab?

Discrete Fourier Transform (DFT) is the discrete version of the Fourier Transform (FT) that transforms a signal (or discrete sequence) from the time domain representation to its representation in the frequency domain. Whereas, Fast Fourier Transform (FFT) is any efficient algorithm for calculating the DFT.