WOLFRAM SYSTEM MODELER
FluModel of an influenza epidemic |
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Diagram
Wolfram Language
In[1]:=
SystemModel["SystemDynamics.IntroductoryExamples.Influenza.Flu"]
Out[1]:=
Information
The influenza model describes the outbreak of an influenza epidemic. The model was adapted from the STELLA manual.
References:
- Richmond, B., S. Peterson, and P. Vescuso (1987), An Academic User's Guide to STELLA, High Performance Systems, Inc., Lyme, N.H.
Simulate the model across 52 time units and plot the four populations:
Outputs (4)
| Non_inf_pop |
Type: Real Description: Non-infected population |
|---|---|
| Inf_pop |
Type: Real Description: Infected population |
| Sick_pop |
Type: Real Description: Sick population |
| Immune_pop |
Type: Real Description: Immune population |
Components (21)
 |
Non_infected |
Type: Level Description: General System Dynamics level |
|---|---|---|
 |
Infection |
Type: Rate_1 Description: Unrestricted rate element with one influencing variable |
|
Infected |
Type: Level Description: General System Dynamics level |
|
Incubation |
Type: Rate_1 Description: Unrestricted rate element with one influencing variable |
|
Sick |
Type: Level Description: General System Dynamics level |
 |
Infection_Rate1 |
Type: Infection_Rate Description: Non-linear infection rate model |
 |
Prod_4_1 |
Type: Prod_4 Description: Product of four influencing factors |
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Contacts |
Type: Const Description: A constant factor |
|
Contraction |
Type: Const Description: A constant factor |
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Incubation_rate |
Type: Rate_equation Description: Non-linear function describing the rate equations |
|
Time_to_Breakdown |
Type: Const Description: A constant factor |
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Contagious |
Type: Add Description: Output the sum of the two inputs |
 |
Perc_Infected |
Type: Division Description: Output first input divided by second input |
 |
Total_Pop |
Type: Add3 Description: Output the sum of the three inputs |
|
Immune |
Type: Level Description: General System Dynamics level |
|
Cure |
Type: Rate_1 Description: Unrestricted rate element with one influencing variable |
|
Cure_rate |
Type: Rate_equation Description: Non-linear function describing the rate equations |
|
Sick_Duration |
Type: Const Description: A constant factor |
|
Immune_Period |
Type: Const Description: A constant factor |
|
Activation |
Type: Rate_1 Description: Unrestricted rate element with one influencing variable |
|
Activation_rate |
Type: Rate_equation Description: Non-linear function describing the rate equations |