how to compute derivative
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having all the values in the above equation, is the below code correct for dE(t)/d(t) computation?
dEt = beta * (1 - sigma) * St * It - (mu + alpha) * Et
what do i need to do to compute dE(t)/d(t)
4 个评论
darova
2021-4-4
Looks like differential equation. DO you have initial value 
?
?You can use ode45
Elysi Cochin
2021-4-4
darova
2021-4-4
Do you have any attempts?
John D'Errico
2021-4-4
What you have not said is explicitly WHAT you have.
What does it mean to have values?
is beta a fixed known constant? How about mu and alpha?
Is S known as a function, or do you have a list of points for S as a function of t?
Similarly for I(t). Is that known?
Is E(t) known, or are you trying to solve for E(t). That would make this a differential equation, if E is an unknown function.
Finally, do you have some sort of initial value for E(t) at some fixed value for t?
采纳的回答
darova
2021-4-5
Only you know initial conditions. Imagine the situation: you are throwing the ball, initial conditions are velocity and angle. Only you know how you want to throw the ball
YOu should use for loop to get solution for all your values
for i = 1:size(SIE,1) % numer of rows
S = SIE(i,1);
I = SIE(i,2);
E = SIE(i,3);
[t,E] = ode45(@(t,E) myfunc(t,S,I,E),tspan,E);
line(t,E)
end
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