This parameter controls whether the piecewise-linear approximation of a function constraint is an underestimate of the function, an overestimate, or somewhere in between. A value of will always underestimate, while a value of will always overestimate. A value in between will interpolate between the underestimate and the overestimate. A special value of -1 chooses points that are on the original function.
See the discussion of function constraints for more information.
For examples of how to query or modify parameter values from our different APIs, refer to our Parameter Examples.