computes the value of the gradient at x . the components of the gradient vector are the partial derivatives of the function with respect to each of the parameters lower bound and higher bound . concode_field_sep double hi concode_elem_sep double lo concode_field_sep UnivariateFunction derivative concode_elem_sep double value concode_elem_sep double value concode_elem_sep double value concode_elem_sep void validateParameters
double [ ] function ( double arg0 , double ... arg1 ) { validateParameters ( arg1 ) ; final double loc0 = arg1 [ 0 ] ; final double loc1 = arg1 [ 1 ] ; return new double [ ] { 1 / ( loc0 - arg0 ) , 1 / ( loc1 - arg0 ) } ; }