clear;clc;close all; fs=100;T=10;N=T*fs; t=0:1/fs:T; % 采样率100HZ z=(1+sin(2*pi*t)).*sin(2*pi*10*t);%调幅信号 imf = emd(z); %%%%%%%%%%EMD = hhspectrum(imf); ??? Undefined function or method 'instfreq' for input arguments of type 'double'. Error in ==> hhspectrum at 46 f(i,:)=instfreq(an(i,:)',tt,l)'; 一运行到 = hhspectrum(imf); 就出现问题 ,什么原因啊啊 ...