Why would I get two consecutive values the same when executing the loop below?

I am trying to calculate the sample cross correlation function in matlab using this code:

fs=4000;
Ts=1/fs;
tb=.055;
te=.115;
Ta=.060;
T=.050;
A=10.0;
fc=1000;
theta=0;
idx3=1;
R=0;
for TAUk=(kb*Ts):Ts:(ke*Ts)
    for ti=(ib*Ts):Ts:((TAUk/Ts+N2-1)*Ts)
        if (ti-TAUk)>=0 && (ti-TAUk)<=T && ((ti-TAUk)/Ts)>0 && ((ti-TAUk)/Ts)<(N2-1)
        g2b=A*cos(2*pi*fc*(ti-TAUk)+theta);
        else
        g2b=0;
        end
        if Ta<=ti && ti<=(T+Ta) && (ti/Ts)<ie
        g1b=A*cos(2*pi*fc*(ti-Ta)+theta);
        else
        g1b=0;
        end
        R=R+g1b*g2b;
    end
Rxyb(idx3)=2*(1/N2)*R;
idx3=idx3+1;
end

My problem is that the data I get back should by symmetric about its max value and it is off by like a tenth. Also, I get back the same value for two consecutive indicies of Rxyb which I also don't think should be the case. If anyone has any pointers I could really use some help. I have been staring at this for several days now and can't figure it out.

Terrell