Data Initialization
Initialization syntax
The initialization of sets, parameters, and variables in an AIMMS application can be done in several ways:
through the InitialData attribute of sets, and parameters,
by reading in data from a text file in AIMMS data format,
by reading in data from a previous AIMMS session stored in a binary case file,
by reading in the data from an external ODBC-compliant database, or
by initializing an identifier through algebraic assignment statements.
Order of initialization
When starting up your AIMMS application, AIMMS will initialize your model identifiers in the following order.
Following compilation each identifier is initialized with the contents of its
InitialDataattribute.Subsequently, AIMMS will execute the predefined procedure
MainInitialization. You can use it to specifyREADstatements to read in data from text files, case files or databases. In addition, it can contain any other algebraic statement necessary to initialize one or more identifiers in your model. Of course, you can also leave this procedure empty if you so desire.
The full details of model initialization are discussed in Data Initialization, Verification and Control.
Entering the InitialData attribute
The InitialData attribute of an identifier can contain any
constant set-valued, set element-valued, string-valued, or numerical
expression. In order to construct such expressions (consisting of mostly
tables and lists), AIMMS offers so-called data pages which can be
created on demand. These pages help you enter the data in a convenient
and graphical manner.