iteratively changing a value within a line of code based on the output

I am having issues with the lines presented in the second section of the code below. I think it is inefficient to type it like this. Normally I would place all of the xn0,xn1...xn8 values into an array and then call the correspodning elements to be summed with the corresponding tc1 elements. However, I only know xn0 (although i can compute the rest) and therefore do not know how to approach this problem. Any help is greatly appreciaated.

(Sorry if the title was misleading I didnt know what to call this question. I also struggled to word it and hope the code can clarify my issue )

h1 =[0.6,0.617725,0.63545,0.653175,0.6709,0.688625,0.70635,0.724075];
h2 = [0.617725,0.63545,0.653175,0.6709,0.688625,0.70635,0.724075,0.7418];
fh1 = [276.981849374449,256.563282315502,233.338198927531,206.859609346339,176.571144087757,41.772230732072,101.568977010934,54.8034249508092]
fh2 = [256.563282315502,233.338198927531,206.859609346339,176.571144087757,41.772230732072,101.568977010934,54.8034249508092,-0.0508040527532690]
tc1 = ((h2-h1)./2).*(fh2+fh1);
xn0 = 0
%% I would prefer to be able to loop this such that xn1 replaces xn0, and then this is replaced by xn3 ,all while the column number is changing to 
xn1 = xn0+tc1(:,1);
xn2 = xn1+tc1(:,2);
xn3 = xn2+tc1(:,3); 
xn4 = xn3 +tc1(:,4);
xn5 = xn4 + tc1(:,5);% Continues on after this line  (for each of the 8 columns in tc1)
%% My problem with using for loop 
for i = [1:1:8]
    xn1(i) = xn0+tc1(:,i) % This would just add each element from tc1 to xn0.  I dont know how to get xn0 to change to xn1, and then that to the next etc  
end