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concepts:scenario_management_-_understanding_scenarios_variables_and_instances [2009/10/16 15:19] deryn.crockett |
concepts:scenario_management_-_understanding_scenarios_variables_and_instances [2009/10/16 15:44] deryn.crockett |
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===== Scenario Management ===== | ===== Scenario Management ===== | ||
- | During a simulation run, calculators in a model are run with given values for control variables to produce a set of outputs. | + | During a simulation run, calculators in a model are run with given values for control variables to produce a set of outputs. Control variable values are saved as instances. Collections of instances are saved as scenarios. By using scenarios, a user can quickly recall a set of variable values used to create a given model output and can compare sets of values within different scenarios. The relationship among variables, instances, and scenarios is shown in the diagram below. |
{{concepts:ScenarioManagement.jpg}} | {{concepts:ScenarioManagement.jpg}} | ||
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+ | Key points to note: | ||
* An instance is a value for a variable. | * An instance is a value for a variable. | ||
* All variables must have at least one instance. | * All variables must have at least one instance. | ||
* Variables can have multiple instances. | * Variables can have multiple instances. | ||
- | * For a simulation run, variables use one and only one instance | + | * For a simulation run, variables use one and only one instance. |
- | * Saved collection of instances is a scenario | + | * Saved collection of instances is a scenario. |
- | * Instances do not have to be used in any scenario | + | * Instances do not have to be used in any scenario. |
+ | * Worksheet reflects the current set of instances being used. | ||
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- | Worksheet reflects the current set of instances being used |