Specifies the differencing that is used to estimate partial derivatives of the Objective and Constraint functions. Use Forward ...

Specifies the differencing that is used to estimate partial derivatives of the Objective and Constraint functions. Use Forward for most problems, in which the Constraint values change relatively slowly. Use Central for problems in which the Constraints change rapidly, especially near the limits. Although this option requires more calculations, it might help when Solver returns a message that it could not improve the solution.