lag time in matlab

hey, I researched how to find the lag time in Matlab and I found a code that worked for the online example, but did not calculate the correct lag in mine.. I have two signal that are 2x100 size both and one is delayed version of other. The code though its complicated a bit, Is there a quicker way in Matlab to calculate the lag time, any in-built function?

mxlag=100;   % Make a guess
R=zeros(2*mxlag+1,1);
 for ilag=1:mxlag
     t1=detrend(X(1:end-ilag),0);  % Remove mean
     t2=detrend(X1(ilag+1:end),0);
     R(ilag+mxlag+1)=mean(t1.*t2)/(std(t1)*std(t2));
     t1=detrend(X1(1:end-ilag),0);
     t2=detrend(X(ilag+1:end),0);
     R(mxlag+1-ilag)=mean(t1.*t2)/(std(t1)*std(t2));
 end
 % Zero lag
     t1=detrend(X,0);
     t2=detrend(X1,0);
     R(mxlag+1)=mean(t1.*t2)/(std(t1)*std(t2));
     lag=[-mxlag:mxlag]';
     [Rmx,imx]=max(R);
     num2str(lag(imx)*pi);
     disp(['The calculated lag is: ' num2str(lag(imx)*pi)]);

Answer 1

[nadom mutlib]

use cross correlation function it is easier. xcorr(x,y).