Graph can not show correct point
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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?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/472232/image.jpeg)
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
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Answers (1)
Mischa Kim
on 28 Dec 2020
Edited: Mischa Kim
on 28 Dec 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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