concepts:scenario_management_-_understanding_scenarios_variables_and_instances
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concepts:scenario_management_-_understanding_scenarios_variables_and_instances [2009/10/16 15:33] deryn.crockett |
concepts:scenario_management_-_understanding_scenarios_variables_and_instances [2009/11/05 20:13] (current) 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. 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. | + | 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. A collection of a instances for all variables in the model is saved as a scenario. A scenario may be described as an instantiation snapshot. 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 between different scenarios. There is a one-to-one relationship between an input set of variable values and the corresponding model output so that the output may always be derived from the input. The relationship among variables, instances, and scenarios is shown in the diagram below. |
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| + | {{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. | ||
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| * Worksheet reflects the current set of instances being used. | * Worksheet reflects the current set of instances being used. | ||
| - | {{concepts:ScenarioManagement.jpg}} | ||
concepts/scenario_management_-_understanding_scenarios_variables_and_instances.1255707208.txt.gz · Last modified: 2009/10/16 15:33 by deryn.crockett
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