WHERE: Difference between revisions
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) WHERE ( | ) WHERE ( | ||
reference IN components == TRUE; | reference IN components == TRUE; | ||
n_trays | n_trays > 5; | ||
feed_location | feed_location > 2; | ||
feed_location | feed_location < n_trays - 2; | ||
) REFINES colmodel(); | ) REFINES colmodel(); | ||
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<source lang="a4c">demo IS_A demo_column(['methanol','water'],'water',13,7);</source> | <source lang="a4c">demo IS_A demo_column(['methanol','water'],'water',13,7);</source> | ||
See also: | |||
* [[Object-oriented modelling]] | |||
* [[REFINES]] | |||
== Use in ALIASES statement == | == Use in ALIASES statement == | ||
Latest revision as of 09:29, 31 July 2010
WHERE is used in object-oriented modelling to impose constraints on the parameters of a parametric model in ASCEND.
WHERE is also used in ALIASES statements to specify the indexes to be used in an array of aliases.
See also ALIASES, WILL_BE and WILL_BE_THE_SAME.
Use in model declaration
MODEL demo_column( components IS_A set OF symbol_constant; reference IS_A symbol_constant; n_trays IS_A integer_constant; feed_location IS_A integer_constant; ) WHERE ( reference IN components == TRUE; n_trays > 5; feed_location > 2; feed_location < n_trays - 2; ) REFINES colmodel(); (*... rest of model follows ...*) END demo_column;
The above model is instantiated using the code
demo IS_A demo_column(['methanol','water'],'water',13,7);
See also:
Use in ALIASES statement
For an example, see ALIASES.