Frequency of FFT plot

For a simple sine function with frequency f0 = 1 [Hz] and a time interval of 1 second, I have to make a plot of the real and imaginary part of the DFT (using fft(xt)). Now I am struggling with the frequency vector: how do I define it? I thought it'd be straightforward but unfortunately I cannot check for the options I have if these are correct.

Answer 1

[dpb]

See

doc fft

and the second section of the example showing how to get the one-sided PSD and frequency associated with the two-sided Matlab implementation of the DFFT.