MATLAB: I don’t get any results from this code

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I run the following code:
for ii = length(pks4)  %repeat the following process as many times as the pks4 points are
    for k2 = (pks4(ii):xfb(end)); % for all k2 that belong between pks4 and the end of index
        first2(ii) = k2(k2>xfb2); %find all k2 such that k2 is greater than xfb2
        if ~isempty(first2)
            first2 = first2(1);  % store the first number (first2) which is greater than xfb2
        else
            disp('No value of k2 is greater than xfb2.')
        end
        distS(ii) = size(pks4(ii):first2(ii)); % distance between each pks4 and first2 points
        mean_distS = mean(numPointsS(ii));  % mean distS
        Send = locs_SwaveB*mean_distS;  %location of S point
    end
end
but in the end I get neither an error message nor any results. What's wrong with this code? And why Matlab doesn't give any error messages?
Thanks in advance for any help.

Best Answer

The first length(pks4) entries in pks4 might all be greater than xfb(end) so the inner loop might never execute.
Caution: you have
   first2(ii) = k2(k2>xfb2); %find all k2 such that k2 is greater than xfb2
Your comment implies there might be multiple k2 entries that fit the criteria, so the right hand side might be a vector, but you are trying to assign it into location that only fits a scalar.
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