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how to plot graph for SIR epidemic model

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Ruksana Shaikh
Ruksana Shaikh 2022-1-18
回答： Sunday Aloke 2022-11-2
my SIR epidemic model is
dS/dt= beta-lembda*I*S-u*S;
dI/dt=lembda*I*S-u*I-gamma*R;
dR/dt=gamma*R-u*R;
t=0:1:100;
gamma=.10;
lembda=.5;
u=.2;
S=50;I=20;R=30;
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Ruksana Shaikh
Ruksana Shaikh 2022-1-18
function x = sir(t, x)
x(1)=0:50:100;
x(2)=0:10:50;
x(3)=0:10:70;
beta = .5;
delta = .3;
x(1) = -beta * x(1) * x(2);
x(2) = beta * x(1) * x(2) - delta * x(2);
x(3) = delta * x(2);
plot (t,x(1),t,x(2),t,x(3))
end

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Sunday Aloke
Sunday Aloke 2022-11-2
Please I need help on the matrix in the document attached. My MATLAB has no symbolic toolbox as in to run, can someone help me and get the determinants of the matrices l?
Thanks

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