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Hi, in the code, the equation used to find xt is given as

xt = x(idx) + (-h(idx) + log(hprime(idx)(cuu(1) - sc(idx)) + ...
exp(hu(idx)))) / hprime(idx);

however, as given in the original paper, equation should be z(idx) instead of x(idx) + (-h(idx)/ hprime(idx).

I assumed you find the new z(i) using the idx found based on the largest value of Sc/Cu < u(1). As there is no h(x{i+1}) , the new z(i) boils down to x(idx) + (-h(idx)/ hprime(idx) which is why you used that to find xt in ars.m.

May I know if my assmption is correct?