impose a condition on a general value of a vector

Hi every one,

I have to do an optimization ( with fmincon), where I have a constraint one the trajectory .

basically I want that my vehicle passes to a point during its flight, it is not important when or where it is that point, only important that during the all trajectory it passees for a selected point. this point can't be the initial or final point.

for example in the case that it is the end point I can write : err_latitude = (latitude(end) - latitude_data)

if it is a general point of latitude vector coming out from ode ?

I cannot write latitude(5) or 10, or anyothers number, because optimization could not converge.

I need to tell to contraint function:

" I give to you the entire vector of latitude", one point of this vector must be equal to this value (latitude_data) ( but not initial or final), you must choose the better point in the vector

many thank for your time and considerations

Kind regards