The OSInstance API

The OSInstance API can be used to:

• get information about model parameters, or convert the OSExrpressionTree into a prefix or postfix representation through a collection of get methods,

• modify, or even create an instance from scratch, using a set of set methods,

• provide information to solvers that require function evaluations, Jacobian and Hessian sparsity patters, function gradient evaluations, and Hessian evaluations.