Graph can not show correct point

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Carey n'eville
Carey n'eville il 28 Dic 2020
Modificato: Mischa Kim il 28 Dic 2020
Dear friends, I have code below but when I run the code, it gives me this graph. But it should colour the graph at point x=10, x=20 and x=40. I guess it shift and there is a problem. How could I fix it?
CODE:
XS0=[2, 1000];
tspan = [0 40];
[t,XS]=ode45(@BSfunction, tspan, XS0);
figure
hold on
plot(t,XS(:,1),t,XS(:,2))
plot(t(1:10),XS(1:10,1),'r',t(10+1:20),XS(10+1:20,1),'b', t(20+1:end),XS(20+1:end,1),'g')
xlabel('time (year)')
ylabel('Concentration (mg/L)')
function dXSdt=BSfunction(~,XS)
X = XS(1); S = XS(2);
X0=2;
Sin=1000;
So=0;
S0=So+Sin;
V=20;
TH=40;
ko=0.2;
kd=0.01;
Ks=150;
Y=0.5;
S=S0-((ko/Y)*X0*TH);
biomassgrowth=((ko*S*X)/(Ks+S))-(kd*X);
substratutilize = -((ko/Y)*X0);
dXSdt = [biomassgrowth; substratutilize];
end

Risposte (1)

Mischa Kim
Mischa Kim il 28 Dic 2020
Modificato: Mischa Kim il 28 Dic 2020
Hi Carey, ode45() picks its own time steps to do the integration. However, you can prescribe the times at which you want integration results. E.g. use
tspan = linspace(0,40,41);

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