List[Null, Null, Null, Null, Null, Null, Null, Notebook[List[Cell[CellGroupData[List[Cell["Variability Prefixes", "Title"], Cell[TextData[List["\n", "The prefixes ", StyleBox["constant, parameter, discrete", Rule[FontFamily, "Courier"]], " of a variable declaration are called variability prefixes and define in which situations the value of a variable may change and when it is kept constant.  A ", StyleBox["constant", Rule[FontFamily, "Courier"]], " has the least variability. A ", StyleBox["parameter", Rule[FontFamily, "Courier"]], " has some more variability since it can be changed between simulations. ", StyleBox["Discrete", Rule[FontFamily, "Courier"]], " variables are variables that change value only at ", ButtonBox["event instants", RuleDelayed[ButtonData, List[FrontEnd`FileName[List[ParentDirectory[], "DiscreteHybrid"], "SampleClock.nb", Rule[CharacterEncoding, "WindowsANSI"]], None]], Rule[ButtonStyle, "Hyperlink"]], ". ", StyleBox["Boolean", Rule[FontFamily, "Courier"]], ", ", StyleBox["Integer", Rule[FontFamily, "Courier"]], ", and ", StyleBox["String", Rule[FontFamily, "Courier"]], " variables are discrete-time by default. \n"]], "Text"], Cell[TextData[List["class VariabilityPref\n  ", StyleBox["constant", Rule[FontColor, RGBColor[0, 0, 1]]], " \t\tReal \t\tPI \t= 3.14159;\n  ", StyleBox["parameter", Rule[FontColor, RGBColor[0, 0, 1]]], " \tReal \t\tp \t= 36.7;\n  ", StyleBox["discrete", Rule[FontColor, RGBColor[0, 0, 1]]], " \t\tBoolean \tbo \t= false;\nend VariabilityPref;"]], "ModelicaInput"]], Open]]], Rule[FrontEndVersion, "4.1 for Microsoft Windows"], Rule[ScreenRectangle, List[List[0, 1280], List[0, 951]]], Rule[WindowSize, List[876, 924]], Rule[WindowMargins, List[List[36, Automatic], List[Automatic, 0]]], Rule[StyleDefinitions, "MathModelica.nb"]], Null, Null, Null, Null, Null]