[LYLF]

N=8;
t=0:N-1;
xn=('edit1')
Xk=fft('xn',N); 到这里就报错！！
plot(Xk);
stem(t,abs(Xk),'.');
axes(handles,axes2,[0,20,0,20]);
ylabel('|Xk|');
title('8点FFT变换');
??? Error using ==> fft
Not enough input arguments.

Error in ==> fft at 34
builtin('fft', varargin{:});
求解！~谢谢