Multiple if condition inside multiple for loops

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hi I am having some problems. I need to apply 3 conditions simultaneously. but I don't understand that it is correct or not. I am attaching the data files and matlab code which I wrote. Can anybody help please .Please check if statement. Actually I want to find indices 'k' and 'm' with the condition 'k<m' and then use these indices in computation of our main variable u_c.

%%%% Construction of U
u_c(1)=u(1); u_c(N+1)=u(N+1);
for i=2:N
    for m=2:N
        for k=2:N
            if (((z(k-1)+z(k))/2)<((x(i-1)+x(i))/2)<((z(k+1)+z(k))/2))&&...
                   (((z(m-1)+z(m))/2)<((x(i+1)+x(i))/2)<((z(m+1)+z(m))/2))&&(k<m)
                s_c=0;
                for j=k+1:m-1
                    s_c=s_c+(hnold(j)*u(j));
                end
                s_c;
                u_c(i)=(1/hn(i))*((((z(k+1)+z(k))/2-(x(i-1)+x(i))/2)*u(k))+...
                    (((-z(m-1)+z(k))/2+(x(i+1)+x(i))/2)*u(m))+s_c);
            elseif  (((z(m-1)+z(m))/2)<((x(i-1)+x(i))/2)<((z(m+1)+z(m))/2))&&...
                    (((z(m-1)+z(m))/2)<((x(i+1)+x(i))/2)<((z(m+1)+z(m))/2))
                u_c(i)=u(m);
            end
            break
        end
    end
    break 
end  

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Vladimir Sovkov 2019-12-1

At the first glance, the "if" statements look correct (if only all the parenthesis are correctly paired). However, thanks to the "break" statements, your program will always deal with k=2 and n=2 alone, nothing else.

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