matlab 讲解 回声消除 我有程序但是运行很久不知道原因

function [e,mse,ce] = nlms(ylong,xlong,L,hEP)
% adaptive filter here with the following inputs and outputs:
%ylong this is a lngexp by 1 vector of far-end signal
%xlong a lngexp by 1 of near-end signal
%L, the length of the adaptive filter scalar
%hEP, the L by 1 vector is the true echo path vector
%e is a lngexp by 1 vector of cancelled echo
%mse is a lngexp by 1 vector of filtered error energy expressed in dB
%ce is a lngexp by 1 length vector of coefficient error expressed in dB
mu=0.5;
delta=0.01;
alpha=0.95;

ylngexp = length(ylong);
xlngexp = length(xlong);
lngexp = min(xlngexp,ylngexp);
e=zeros(lngexp,1);
mse=zeros(lngexp,1);
ce=zeros(lngexp,1);

w=zeros(L,1);
y=zeros(L,1);
hEP=hEP(:);

for n=1:lngexp
   y=[ylong(n);y(1:L-1)];
   x = y'*w;
   e(n)=xlong(n) - x;
   wdelta=mu*y*e(n)/(delta+y'*y);
   w=w+wdelta;
   if n>=2
       mse(n)=alpha*mse(n-1)+(1-alpha)*e(n)^2;
   else
       mse(n)=alpha*0+(1-alpha)*e(n)^2;
   end
   ce(n)=10*log10(((hEP-w)'*(hEP-w))/(hEP'*hEP));
end
mse=10*log10(mse);
	           

答案：只要是matlab界面在左下角显示busy，就说明程序在运行，不用担心，等等就好，一般复杂的程序运行几个小时都是很正常的啊

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