ATOM - Revision history

Jpye at 23:47, 28 February 2012

2012-02-28T23:47:36Z

← Older revision		Revision as of 23:47, 28 February 2012
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	Note in the above the wildcard dimension, {?}.		Note in the above the wildcard dimension, {?}.

			Most of the 'standard' atom types that you will need are declared in {{src\|models/atoms.a4l}}.

	For more detail, see the [[:Category:Documentation\|user's manual]].		For more detail, see the [[:Category:Documentation\|user's manual]].

Jpye at 17:31, 2 February 2012

2012-02-02T17:31:32Z

← Older revision		Revision as of 17:31, 2 February 2012
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	~~<div>''This article is~~ incomplete ~~or needs expanding. Please help out by adding your comments.''</div>~~		{{incomplete}}
	The '''ATOM''' statement is used to declare new variable types in ASCEND. These can be symbol, boolean, integer, or real-valued. The capabilities of ASCEND in solving models with these types of atoms depends on what solver is used. The ATOM statement is used to refine the definition of base variable types. You can add additional parameters such as upper and lower bounds, and scaling parameters, as well as defining the [[dimensions]] for the variable.		The '''ATOM''' statement is used to declare new variable types in ASCEND. These can be symbol, boolean, integer, or real-valued. The capabilities of ASCEND in solving models with these types of atoms depends on what solver is used. The ATOM statement is used to refine the definition of base variable types. You can add additional parameters such as upper and lower bounds, and scaling parameters, as well as defining the [[dimensions]] for the variable.


	Atom types may declare attribute fields with types real, integer, boolean, symbol, and set. These attributes are not independent objects and therefore cannot be refined, merged, or put in a refinement clique ([[ARE ALIKE]]).		Atom types may declare attribute fields with types real, integer, boolean, symbol, and set. These attributes are not independent objects and therefore cannot be refined, merged, or put in a refinement clique ([[ARE ALIKE]]).
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	Note in the above the wildcard dimension, {?}.		Note in the above the wildcard dimension, {?}.

	For more detail, see the [[Category:Documentation\|user's manual]].		For more detail, see the [[:Category:Documentation\|user's manual]].

	See also [[Units of measurement]].		See also [[Units of measurement]].

			[[Category:Incomplete]]


	[[Category:Incomplete]]
	[[Category:Syntax]]		[[Category:Syntax]]

Jpye at 03:13, 19 May 2010

2010-05-19T03:13:16Z

← Older revision		Revision as of 03:13, 19 May 2010
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	<div>''This article is incomplete or needs expanding. Please help out by adding your comments.''</div>		<div>''This article is incomplete or needs expanding. Please help out by adding your comments.''</div>
	The '''ATOM''' statement is used to declare new variable types in ASCEND. These can be symbol, boolean, integer, or real-valued. The capabilities of ASCEND in solving models with these types of atoms depends on what solver is used. The ATOM statement is used to refine the definition of base variable types. You can add additional parameters such as upper and lower bounds, and scaling parameters, as well as defining the [[~~Dimensions~~]] for the variable.		The '''ATOM''' statement is used to declare new variable types in ASCEND. These can be symbol, boolean, integer, or real-valued. The capabilities of ASCEND in solving models with these types of atoms depends on what solver is used. The ATOM statement is used to refine the definition of base variable types. You can add additional parameters such as upper and lower bounds, and scaling parameters, as well as defining the [[dimensions]] for the variable.

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<div>''This article is incomplete or needs expanding. Please help out by adding your comments.''</div>
The '''ATOM''' statement is used to declare new variable types in ASCEND. These can be symbol, boolean, integer, or real-valued. The capabilities of ASCEND in solving models with these types of atoms depends on what solver is used. The ATOM statement is used to refine the definition of base variable types. You can add additional parameters such as upper and lower bounds, and scaling parameters, as well as defining the [[Dimensions]] for the variable.

Atom types may declare attribute fields with types real, integer, boolean, symbol, and set. These attributes are not independent objects and therefore cannot be refined, merged, or put in a refinement clique ([[ARE ALIKE]]).

The syntax for declaring a new atom type is

<source lang="a4c">ATOM atom_type_name REFINES variable_type
«DIMENSION dimension_expression»
«DEFAULT value»; (* note the semicolon *)

«initial attribute assignments;»
END atom_type_name;</source>

An example is the declaration of the [[solver_var]]:

<source lang="a4c">ATOM solver_var REFINES real DEFAULT 0.5 {?};

lower_bound IS_A real;
upper_bound IS_A real;
nominal IS_A real;

fixed IS_A boolean;
fixed := FALSE;
lower_bound := -1e20 {?};

upper_bound := 1e20 {?};
nominal := 0.5 {?};

END solver_var;</source>

Note in the above the wildcard dimension, {?}.

For more detail, see the [[Category:Documentation|user's manual]].

See also [[Units of measurement]].

[[Category:Incomplete]]
[[Category:Syntax]]