1. In a computing device, a method of analyzing a model of a physical dynamic system in a modeling environment, the method comprising: providing a model of a dynamic system, where the modeled system includes a plurality of elements; receiving via an interface a selection, the selection including a selected element, where: the selected element is included in a display of model elements, the selected element includes a parameter having a digital effect, and the digital effect affects: a stability of the modeled system when code for the modeled system is executed, or a required performance of the modeled system when code for the modeled system is executed; receiving a specification of stability or performance criteria for the model; programmatically extracting a linear fractional representation from the model based on the selection of the selected element; simulating the model and the linear fractional representation, the simulating producing a result; analyzing programmatically the linear fractional representation based on the result of the simulation, the analyzing identifying a value for the parameter of the selected element that causes the executed model to satisfy the stability or performance criteria; and programmatically determining, based on the analyzing, a hardware requirement required for a digital system to execute code representing the model.