Abstract: A device may determine historical state values to be used to calculate a current state value of a wrapped state associated with a model element. The wrapped state may be associated with a range of state values. The device may calculate the current state value of the wrapped state based on the historical state values, and may determine that the current state value is outside of the range of state values. The device may generate a modified current state value based on determining that the current state value is outside of the range of state values. The modified current state value may be within the range of state values. The device may modify a historical state value based on determining that the current state value is outside of the range of state values. The device may provide or store the modified current state value and the modified historical state value.

Abstract: Two or more solvers used in a simulation of a dynamic system may exchange information during minor steps of at least one of the solvers. The information may be exchanged one way—that is, a first solver sending the information to a second solver after the second solver's minor step, or it may be exchanged two ways (or multiple ways in a case with more than two solvers). If the solvers are instances of the same type of solver, they may exchange information at each minor step.