File:Sirsys-p9.png
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Summary
| Description |
(Colors are believed to be: Blue=Susceptible, Green=Infected, and Red=Recovered) |
| Date | 6 June 2006 (original upload date) |
| Source | No machine-readable source provided. Own work assumed (based on copyright claims). |
| Author | No machine-readable author provided. Bye~commonswiki assumed (based on copyright claims). |
sirsys.m program
beta=0.001;v=0.1;%;%before modified, beta=0.005，v=0.05，
the figure produced by running this program in matlab is different with Fig.Sirsys-p9.png
so let beta=0.001,v=0.1, and try again, then the resoult is right.
options = odeset ('RelTol',1e-4,'AbsTol',1e-4);
[T,Y] = ode45(@sirsys1,[0 60],[500 1 0],options,beta,v);
plot(T,Y(:,1),'.',T,Y(:,2),'.',T,Y(:,3),'.')
sirsys1.m function
function dy = sirsys1(t,y,beta,v) dy = zeros (3,1); dy(1)=-beta*y(1)*y(2); %(force of infection) lambda = beta*y(2) dy(2)=beta*y(1)*y(2)-v*y(2); dy(3)=v*y(2);
Licensing
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:38, 6 June 2006 | | 560 × 420 (7 KB) | Bye~commonswiki | An epidemiological graph for the SIR model. S represents the number of susceptibles, I the number of infectious people and R the number of recovered. Graph generated using MATLAB code: ==== sirsys.m program==== <pre> beta=0.001; v=0.1; options = odeset (' |
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