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Difference between revisions of "STEM Expression Language"
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Revision as of 16:12, 19 June 2013
Contents
About STEM Expressions
Expression Editor
The Visual Editor's Expression Editor is a simple tool to enter the equations that describe the movement of a population between two compartments for each region for each step of the simulation. The transition value - the delta - as calculated by the equation entered represents a balanced decrease from the source compartment equal to the increase in the target compartment.
Select a Transition
To select a transition, a user may either:
- Select from the Visual Editor's canvas using the Chooser Tool
- Select from the Transition drop-down menu
The Expression
Delta
The last statement in the expression editor must start with the word "delta". This is the final value that is used to compute the movement from source to target compartments.
Contextual Content Assist
Errors
Select Incidences
For internal and reporting purposes, the STEM simulation engine needs to know which transitions represent an increase in disease incidence. The (positive) delta value of the transition will be added to each incidence total after each step.
A transition can account to zero or more incidences that are included in a disease. Under For Incidence, check the box(es) next to the incidence name for a given transition.