ipopt solver external function that computes the constraints for CUTEr.
c = ipopt_cntr(x)
A vector, the current value of the unknown
A vector, the current value of the constraint functions.
This function computes the value of the constraints at the point
x
for the current CUTEr problem according to
the ipopt
requirements.
It includes a cpu time limitation to cancel the resolution if the cpu time exceeds 3600s.