STEM help / Data dialogs

Transformation / Previous

A Previous transformation may be selected from the Type menu in the Input and Transformation dialog. The Previous transformation allows modellers access to values from the preceding time period, no matter what time periods are used.

These inputs are accessed via the Input and Transformation dialog.

Output Unit

Select the output unit that you want to use from the drop-down list box, or define your own. The selection has no effect on the model but is used in results graphs.

Default: none.

Features See Multiplier Transformation, Transformations.

Multiplier (2)

Multiplies the Input of a Transformation to calculate its Output.

Default: Constant {1.0}.

Features See Multiplier Transformation, Transformations.

Previous

Costs

If defined, this input of a Previous or Time Lag transformation is used as an alternative target for cost-allocation in order to avoid the circularity which would otherwise arise if the transformation were used to calculate a difference equation indirectly involving ‘itself’ (i.e., an earlier value of the same transformation).

Default: Resource (<none>, Installed Capacity).

Features See Transformations.

Initial Input

Defines an initial, pre-run value for the input of a Previous or Delta transformation. This directly controls the output of a Previous transformation in Y0 (or Y1, if Y0 is not included). The output of a Delta transformation in Y0 is the actual value of its Input in Y0 minus the Initial Input value (or Y1, if Y0 is not included).

Default: 0.0.

Features See Transformations.

Input

Identifies an element as a source of demand for a Transformation; together with a Basis, which specifies the particular result, associated with that element, which defines the size of that Input in any year. Expression Transformations have several inputs, called Input 1, Input 2, and so on.

Default: Resource (<none>, Installed Capacity). For an Erlang B Formula transformation, Service (<none>, Busy Hour Traffic). For a Time Factor transformation, Transformation (<none>).

Features See Transformations.

 

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