请问为什么出不了结果

仓坞仓坞

clear; clc fs=1000; t=0:0.01:2; N=length(t); for i=1:N if (t(i)>=0.5)&(t(i)<=0.8)     u(i)=[1+0.1*cos(2*pi*3*t(i))]*cos(2*pi*50*t(i)); elseif (t<0)&(t>2)         disp('erro'); else     u(i)=cos(2*pi*50*t(i));end end data=u; imf=emd(data); [A,f,t]=hhspectrum(imf); [E,t,Cenf]=toimage(A,f); cemd_visu(data,1:length(data),imf); disp_hhs(E); for k=1:size(E,1) bjp(k)=sum(E(k,:))*1/fs; end figure(3);