how to incorporate non instantaneous impulses

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how can we incoporate non-instantaeous impulses in S where S(t)=g(t,S(kT)), and g(T+p,u) = (1-theta)*u in the interval t belongs to the interval[kT,kT+p), k belongs to z^+.

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Anushka
Anushka 2025-1-31
编辑:Anushka 2025-1-31
Hello @jasmin,
To address the query on incorporating non-instantaneous impulses into the given system of equations in MATLAB, here is how you can approach the problem:
  • Use MATLAB's 'ode45' function to solve the differential equations. You can refer to the below given documentation: https://www.mathworks.com/help/matlab/ref/ode45.html
  • Write the equations 'S'(t)' and 'I'(t)' as a system. Here is a snippet of code you can refer to:
function dydt = diff_eqs(t, y, b, beta, alpha, gamma, omega, tau)
S = y(1);
I = y(2);
dS = b - b*S - beta*S*I/(1 + alpha*S) + gamma*I*exp(-b*tau);
dI = beta*exp(-b*omega)*S*I/(1 + alpha*S) - (b + gamma)*I;
dydt = [dS; dI];
end
  • After solving for one interval, update 'S' using 'g(t,S)'. You can refer to the below given code snippet:
function S_new = g(t, S_prev, theta, u)
% Customize based on the problem
S_new = (1 - theta) * u;
end
  • Solve the problem iteratively for each interval [kT,(k+1)T], updating 'S' and 'I' at each step.
Hope this helps!

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