Difference between revisions of "Self"
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− | Self is used in the definition of a Variable to refer to that variable. | + | The keyword [[Self]] is used in the definition of a Variable to refer to that variable. |
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− | The other exception is in [[IntraTable]] | + | Usually, a variable cannot refer to itself -- because it creates a cyclic dependency -- so you cannot use [[Self]] in common expressions. One exception is in the [[Dynamic]] function when referring to [[Self]] at a preceding [[Time]] period, e.g. |
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+ | :<code>Variable X := Dynamic(10, Self[Time-1] * (1 + growth))</code> | ||
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+ | The last parameter of [[Dynamic]] is an expression that can refer to [[Self]], provided it is for a previous [[Time]], as in this case. | ||
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+ | The other exception is in [[IntraTable]] that allows cells of a table to refer to each other, using [[Self]]. |
Revision as of 23:35, 12 January 2016
The keyword Self is used in the definition of a Variable to refer to that variable.
Usually, a variable cannot refer to itself -- because it creates a cyclic dependency -- so you cannot use Self in common expressions. One exception is in the Dynamic function when referring to Self at a preceding Time period, e.g.
Variable X := Dynamic(10, Self[Time-1] * (1 + growth))
The last parameter of Dynamic is an expression that can refer to Self, provided it is for a previous Time, as in this case.
The other exception is in IntraTable that allows cells of a table to refer to each other, using Self.
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