Computes the range over which an objective function coefficient can vary in a linear program without changing the optimal solution. «lp» must be the result of a previous call to LpDefine.
This is apparently only available in a continuous linear program. It cannot be used on an integer or mixed-integer LP.
In 4.2, there is an optional «variable» parameter. This is not of use yet in 4.2, but is there for a feature in a future release. For now, just don't use it.