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concepts:scenario_management_-_understanding_scenarios_variables_and_instances [2009/10/16 15:05] 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 ===== | ||
- | set of values for all control variables in model | + | 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. |
- | Calculators in model run with those values and produce set of outputs | + | |
- | Value is saved as an instance of a variable. | + | {{concepts:ScenarioManagement.jpg}} |
- | All variables have at least one instance | + | |
- | Some variables can have multiple instances | + | Key points to note: |
- | For a simulation run, variables must have one and only one instance | + | |
- | Saved collection of instances is a scenario | + | * An instance is a value for a variable. |
- | Instances do not have to be used in any scenario | + | * All variables must have at least one instance. |
+ | * Variables can have multiple instances. | ||
+ | * For a simulation run, variables use one and only one instance. | ||
+ | * Saved collection of instances is a scenario. | ||
+ | * Instances do not have to be used in any scenario. | ||
+ | * Worksheet reflects the current set of instances being used. | ||
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