This is a code that my team has been trying to fix but with no luck. There is one line on the graph that looks correct but the rest are all very small and wrong.

1 visualización (últimos 30 días)
clear, clc, close all
load("EnvironmentalForcing.mat")
for i = 1:length(T)
if T(i)>0 && T(i)<35
Tb(i) = (0.000241*(T(i)^2.06737))*((35-T(i))^0.72859);
end
end
Bmax = 1;
uLi = sum(Tb);
uL = 1/uLi;
%uL = 6;
uI = 10;
E = 0.001;
Ap = 5000;
Pi = 930.27249;
Si = Pi/Ap;
Li = 0.01*Si;
Ii = 0;
Ri = uI*Ii;
Pbi = 0;
y0 = [Si,Li,Ii,Ri,Pi,Pbi];
ode = @(n,t,S,L,I,R,P,Pb) SLIRP(n, t, S, L, I, R, P, Pb, Bmax, uL, uI, E, T, Ap);
[t,y] = rk4(ode,tspan, y0);
y = y/Ap;
figure
hold on
plot(t,y(1,:),'k')
plot(t,y(2,:),'b')
plot(t,y(3,:),'g')
plot(t,y(4,:),'y')
plot(t,y(5,:),'m')
legend("S","L","I","R","P")
%% Functions
function [dsdt, dldt, dIdt, drdt, dpdt, dpbdt] = SLIRP(n, t, S, L, I, R, P, Pb, Bmax, uL, uI, E, T, Ap)
T = T(n);
d = t;
if T>0 && T<35
Tb = (0.000241*(T^2.06737))*(35-T)^0.72859;
B = Bmax * Tb;
else
B = 0;
end
TE = (-0.35968 + (0.10789*T) - (0.00214*(T^2)));
dpldt = 1.33*d*TE;
dpbdt = ((172.4*Pb) - (21.2*(Pb^2)))*TE;
dpdt = dpbdt + dpldt;
dsdt = (-B*S*I) + (dpdt*(1/Ap));
dldt = ((S*I) - (uL*L) + E);
dIdt = (uL*L) - (uI*I);
drdt = uI*I;
end
function [tp,yp] = rk4(f, tspan, y0)
q = length(y0);
N = length(tspan);
t0 = tspan(1);
h = tspan(2) - tspan(1);
tp = zeros(N+1,1);
yp = zeros(q, N+1);
tp(1) = t0;
yp(:,1) = y0;
for n=1:N
[k1(1), k1(2), k1(3), k1(4), k1(5), k1(6)] = f(n, tp(n), yp(1,n), yp(2,n), yp(3,n), yp(4,n), yp(5,n), yp(6,n));
[k2(1), k2(2), k2(3), k2(4), k2(5), k2(6)] = f(n, tp(n) + (0.5*h), yp(1,n) + (0.5*h*k1(1)), yp(2,n) + (0.5*h*k1(2)), yp(3,n) + (0.5*h*k1(3)), yp(4,n) + (0.5*h*k1(4)), yp(5,n) + (0.5*h*k1(5)), yp(6,n) + (0.5*h*k1(6)));
[k3(1), k3(2), k3(3), k3(4), k3(5), k3(6)] = f(n, tp(n) + (0.5*h), yp(1,n) + (0.5*h*k2(1)), yp(2,n) + (0.5*h*k2(2)), yp(3,n) + (0.5*h*k2(3)), yp(4,n) + (0.5*h*k2(4)), yp(5,n) + (0.5*h*k2(5)), yp(6,n) + (0.5*h*k2(6)));
[k4(1), k4(2), k4(3), k4(4), k4(5), k4(6)] = f(n, tp(n) + h, yp(1,n) + (h*k3(1)), yp(2,n) + (h*k3(2)), yp(3,n) + (h*k3(3)), yp(4,n) + (h*k3(4)), yp(5,n) + (h*k3(5)), yp(6,n) + (h*k3(6)));
for j = 1:q
fi(j) = (k1(j)/6)+(k2(j)/3)+(k3(j)/3)+(k4(j)/6);
yp(j,n+1) = yp(j,n) + h*fi(j);
end
tp(n+1) = tp(n) + h;
end
end

Respuestas (1)

Image Analyst
Image Analyst el 27 de Nov. de 2023
Yes, because the scale of the different plots is several orders of magnitude different so you can't see most of them if you use the same y scale. I suggest you plot them on separate axes, or use stackedplot
  5 comentarios
Image Analyst
Image Analyst el 28 de Nov. de 2023
Well we have no idea where your formulas came from so you're going to have to research that yourself. Maybe some of the parameters are off by a few orders of magnitude, or were for different units (e.g. microns instead of meters).
This may help:
CONNOR
CONNOR el 28 de Nov. de 2023
The formulas came from the assignment and same with the parameters. I dont think that those are wrong because I have checked them multiple times. Thanks for the video Ill check it out in hopes it can get me through this wall. Thanks for the help anyway.

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