The full code would go something like this:
filename = 'YourFile.wav';
[y,Fs] = audioread(filename); % Import File
N = size(y,1); % Assuming Column Vectors
t = linspace(0, N, N)/Fs; % Time Vector (If Necessary)
Fn = Fs/2; % Nyquist Frequency
Fy = fft(y)/N;
Fv = linspace(0, 1, fix(N/2)+1)*Fn; % Frequency Vector
Iv = 1:numel(Fv): % Index Vector
figure
plot(Fv, abs(Fy(Iv,:))*2)
grid
