Plotting time series of ODE for several initial values in subplot

3 views (last 30 days)
I am checking the stability of Equilibrium points for a system of 3 ODE numerically via ODE54 and need to plot the result for several initial conditions for example 4 initial condition for each equilibrium point and plot the result in subplots. Is it possible ? is it possible to change the initial value in the title accordingly?
Function
function [dxdt] = Subsystem_NonDim_LFR(t,x,s,epsilon,omega,beta,g12,gamma12)
%UNTITLED2 Summary of this function goes here
% Detailed explanation goes here
dxdt(1,:)=x(1)*(1-x(1)-x(2)-x(3))+s;
dxdt(2,:)=x(2)*(-epsilon(1)*(1+omega(1)*x(2)+omega(2)*x(3))-g12*x(3)+beta(1)*x(1));
dxdt(3,:)=x(3)*(-epsilon(2)*(1+omega(3)*x(2)+omega(4)*x(3))+gamma12*x(2)+beta(2)*x(1));
end
Script:
s=0
omega=[1,2,3,4]
g12=1
gamma12=2
beta=[1,2]
epsilon=[4,3]
s=0
x0=[0, 200 ,100];
t=linspace(0,30,30000);
[t,x]=ode45(@(t,x) Subsystem_NonDim_LFR(t,x,s,epsilon,omega,beta,g12,gamma12),t,x0);
figure
p=plot(t, x(:,1),'r--',t, x(:,2),'b:',t,x(:,3),'g-.')
p(1).LineWidth = 2.5;
p(2).LineWidth = 3;
p(3).LineWidth = 3.5;
xlabel('Time (day)')
ylabel('Populations (num/ml)')
legend('Bacteria','protozoa','Daphnia')
grid
ylim([-5,10 ])
title(' $$x_{0}=[0.00000001,200,100]\ ,\beta_{1}<\epsilon_{1} and\ \beta_{2}<\epsilon_{2}$$','interpreter','latex')

Accepted Answer

darova
darova on 29 Jan 2020
SOmething like that i think
x0=[0, 200 ,100
3 2 1
3 1 2
31 2 1]; % some initial conditions (random)
t=linspace(0,30,30000);
for i = 1:4
[t,x]=ode45(@(t,x) Subsystem_NonDim_LFR(t,x,s,epsilon,omega,beta,g12,gamma12),t,x0(i,:));
subplot(2,2,i)
p=plot(t, x(:,1),'r--',t, x(:,2),'b:',t,x(:,3),'g-.')
p(1).LineWidth = 2.5;
p(2).LineWidth = 3;
p(3).LineWidth = 3.5;
xlabel('Time (day)')
ylabel('Populations (num/ml)')
legend('Bacteria','protozoa','Daphnia')
grid
ylim([-5,10 ])
str = sprintf('$$x_{0}=[%d,%d,%d]',x0(i,:));
title([str '\ ,\beta_{1}<\epsilon_{1} and\ \beta_{2}<\epsilon_{2}$$'],'interpreter','latex')
end

More Answers (0)

Categories

Find more on Programming in Help Center and File Exchange

Products


Release

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!