Plotting nullclines in prey-predator model

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Doaa Mahmoud
Doaa Mahmoud 2022-10-17
评论： Doaa Mahmoud 2022-10-23
Ran in:
I want to plot these four function and I tried this code but I have a problem plotting "fs1" and "fs2" becaue I need each one of them to be plotted as one curve.
I realy need your help
Best Regards
clc
clear
close all
a=0.7;
b=0.6;
r=1.5;
k=12;
beta=0.5;
delta=0.25;
q1=0.25;
q2=0.1;
ET=5;
x=linspace(0, 10, 100);
fs1= (r.*x.*(1-x./k))./(a-b*r.*(1-x./k));
gs1= (x.*(a*beta-delta))/(b*delta);
fs2= -(x.*(k*(q1-r)+r.*x))./(a*k+b*k*(q1 - r)+b*r.*x);
gs2= -(x.*(q2+a*beta-delta))/(b*(q2-delta));
plot(x,fs1,'Color','k','LineWidth',1.5)
hold on
plot(x,gs1,'Color','g','LineWidth',1.5)
plot(x,fs2,'Color','b','LineWidth',1.5)
plot(x,gs2,'Color','r','LineWidth',1.5)
xlim([0 10])
ylim([0 20])
  2 个评论
Sai Kiran
Sai Kiran 2022-10-20
Hi,
I have a doubt regarding your query.
Do you want to plot fs1 and fs2 variables in the same plot? and gs1 & gs2 on another plot?
Can you please elaborate your query?
Doaa Mahmoud
Doaa Mahmoud 2022-10-23
thanks alot for replying.
I knew what was the problem.it was value of one constant was incorrect

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