complex fourier series in matlab

hello can someone please tell me what is the formula used to express a complex fourier series in matlab and how to plot it. thanks in advance.

[Luis Miguel López Santamaría]

Do you find the correct answer because the accept answer is about the fast Fourier transform.

Answer 1

[Azzi Abdelmalek]

http://www.mathworks.com/help/matlab/ref/fft.html

http://www.mathworks.com/help/matlab/ref/fft.html#buuutyt-6