How do I create a loop and put the results that satisfy the loop into a new variable?

I am trying to create a loop that takes the difference between successive items in a vector, and if the difference is less than a value (0.1 in the example below), then put the item in a new vector, called fastTimesChop. I don't know what I am doing wrong, but I get either errors or values in fastTimesChop that are not right. Below is what I have done so far.

fastTimes=(0.033:rand:300);

fastTimesChop=[];

for j=1:(length(fastTimes-1))

    if((fastTimes(j+1))-(fastTimes(j)))<0.815

        fastTimesChop=[fastTimes(j); fastTimes(j+1)];

    end

end

Thank you for any help!!!

Answer 1

[Andrei Bobrov]

a = fastTimes(:);
ii = find(diff(a)<0.815);
fastTimesChop = [a(ii),a(ii+1)];