How to plot multiple iterations of a for loop on the same axes.

Using the ode45 function I am analyzing a set of two ODEs varying one of the inputs from 1 to 9 in steps of 2. I then want to plot the phase plan generated by each iteration on the same set of axes, in a different colour.

My script:

for i=1:2:9
  [t,y]=ode45(@predprey2,[0,30],[i,1]);

    figure
    plot(y(:,1),y(:,2));
    title('Phase plane of prey and predator populations');
    xlabel('Prey Population');
    ylabel('Predator Population');
end

and the called function (predprey2.m):

function output=predprey2(t,y)

dxdt=y(1)-y(1)*y(2);
dwdt=y(1)*y(2)-y(2);

output=[dxdt; dwdt];

end

Any and all help is appreciated.

[Jan]

You forgot to ask a question. What is the point you need help for?

Answer 1

[Marta Salas]

figure 
hold on
for ...
  plot ...
end
title 
xlabel
ylabel

Answer 2

[Jacques]

Try to use hold instead of figure