Note also that fminbnd uses box constraints, and the analogous thing in NLopt is to just write:
lower_bounds!(opt, lbA1)
upper_bounds!(opt, ubA1)
However, Jude, I should also point out that "I don't want to read the
manual, please just write my code for me" is not the most courteous way to
solicit unpaid volunteer help. In general, people are more willing to
help when you've put in an effort yourself.
