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== Attribute of ATOMs == | == Attribute of ATOMs == | ||
Firstly, it is the first-guess value which will be defined for any real-valued [[ATOM | Firstly, it is the first-guess value which will be defined for any real-valued [[ATOM]] instances in a [[MODEL]] when the model is first instantiated. This first guess is usually chosen in the vicinity of the expected solved value of a variable, such that the iterative solver will converge quickly and reliably. Default values are defined in [[ATOM]] statements for each type of atom defined. For example, see {{src|models/atoms.a4l}}. | ||
See also [[upper_bound]], [[lower_bound]], [[nominal]]. | See also [[upper_bound]], [[lower_bound]], [[nominal]]. | ||
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== METHOD name == | == METHOD name == | ||
Second, '''default'' is also the name of a [[METHOD]] used in [[automatic recursive initialisation]] of models. | Second, '''default''' is also the name of a [[METHOD]] used in [[automatic recursive initialisation]] of models. | ||
[[Category:Syntax]] | [[Category:Syntax]] | ||
Latest revision as of 09:14, 2 August 2010
default has two meanings in the ASCEND language.
Attribute of ATOMs
Firstly, it is the first-guess value which will be defined for any real-valued ATOM instances in a MODEL when the model is first instantiated. This first guess is usually chosen in the vicinity of the expected solved value of a variable, such that the iterative solver will converge quickly and reliably. Default values are defined in ATOM statements for each type of atom defined. For example, see models/atoms.a4l.
See also upper_bound, lower_bound, nominal.
METHOD name
Second, default is also the name of a METHOD used in automatic recursive initialisation of models.