There should be one more 'end' at the last for closing the for loop
clc
k = [67.25; 205.25; 223.25; 319.25; 325.25];
nk = 5;
cso = zeros(5,4);
m=-1;
%%For channel subtraction from each other
for i = 1:nk
for j = 1:nk-1
cso(i,j)= k(1,1)- k(j+1,1)
if j==5
kShift = circshift(k,m)
m=m-1;
end
end
end
