Matlab fft number of points

1. How many points do you need for fft?
2. How do you take N point fft in MATLAB?
3. How do you find the N point DFT in MATLAB?
4. What does N point fft mean?

How many points do you need for fft?

Because the FFT function uses a base 2 logarithm by definition, it requires that the range or length of the time series to be evaluated contains a total number of data points precisely equal to a 2-to-the-nth-power number (e.g., 512, 1024, 2048, etc.).

How do you take N point fft in MATLAB?

Y = fft( X , n ) returns the n -point DFT. If no value is specified, Y is the same size as X . If X is a vector and the length of X is less than n , then X is padded with trailing zeros to length n . If X is a vector and the length of X is greater than n , then X is truncated to length n .

How do you find the N point DFT in MATLAB?

A second argument to fft specifies a number of points n for the transform, representing DFT length: n = 512; y = fft(x,n); m = abs(y); p = unwrap(angle(y)); f = (0:length(y)-1)*100/length(y); subplot(2,1,1) plot(f,m) title('Magnitude') ax = gca; ax.

What does N point fft mean?

N is the number of points used to calculate the fft, it does not increase physical resolution but adds more point to the spectrum for more visual resolution, N is arbitrary.