Gets and sets the tolerance for determining whether or not this constraint is satisfied at a particular point. For example the equality constraint c(x) = 0 will be considered to be satisfied at a point x0 if |c(x0)| < Tolerance, and a inequality constraint c(x) >= 0 will be considered to be satisfied at a point x0 if c(x0) >= -tolerance_.

Gets and sets the type of the constraint, either equality or inequality.