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Fig. 1.12
be so great that new contagion tends to cease. Run the model. Indeed, the results
(Figure 1.13) are consistent with our expectation—and so they should be!
1: SICK
100
1
1
1
55
1
10
0.00
20.00
40.00
60.00
80.00
Days
Fig. 1.13
This problem has no analytic solution, only a numerical one. You can continue to
study the sensitivity of the answer to changes in the graph and the size of DT. You
are not limited to a DT of 1. Generally speaking, a smaller DT leads to more accurate
numerical calculations for updating state variables and, therefore, a more accurate
answer. Choose “Time Specs” from the RUN menu to change the DT. Change the
