Differences

This shows you the differences between two versions of the page.

--- concepts:over_all_time_vs._one_time-step_at_a_time [2009/11/24 22:29]
marcus.williams
+++ concepts:over_all_time_vs._one_time-step_at_a_time [2009/11/24 22:40]
marcus.williams
@@ Line 29: / Line 29: @@
 This method also lends itself to transforming existing models to variants by [[concepts:feedback_in_whatif|feedback]] without having to carry the calculational baggage of having to execute all the other models.
 For example suppose model1 was a conventional cohort population model with immigration as exogenous and model 2 was a transportation model with complex dependence on population by age. Now using feedback we want to transform the conventional cohort population model to one in which immigration was proportional to existing population. With the temporally blockwise method of handling time this can be done without ever having to evaluate model2.
+[Other advantages of this blockwise approach, or aspects of the Design Approach that rely on this approach:
+  * tension, and expectation
+  * computational efficiency, number of iterations to convergence when using feedback
+  * modularity
+]
+Rob's diagrams below, for potential inclusion or reference...?
+{{:concepts:control_1.png|}}
+{{:concepts:control_2.png|}}
+{{:concepts:control_3.png|}}

whatIf? Wiki