Clear Filters
Clear Filters

How to plot the trajectories of the equilibrium points

8 views (last 30 days)
I want to plot the trajectories of the equilibrium points and to show the stability of them . This my code to find all the equilibrium points
r1=576; r2=23616/11; r3=39456/11;
a1=572; a2=4420; a3=5850;
b1=308; b2=1804; b3=2970;
c1=b1; c2=b1; c3=594;
syms x y z
vars = [x, y, z];
eqs=[(r1-a1*x-b1*y-c1*z)*x,(r2-a2*x-b2*y-c2*z)*y,(r3-a3*x-b3*y-c3*z)*z];
[xc, yc, zc] = solve(eqs(1), eqs(2), eqs(3));
[xc, yc, zc]
A = jacobian(eqs, vars);
disp('Matrix of linearized system:')
subs(A, vars, [xc(1), yc(1),zc(1)])
disp('eigenvalues:')
eig(ans)
disp('Matrix of linearized system:')
subs(A, vars, [xc(2), yc(2),zc(2)])
disp('eigenvalues:')
eig(ans)
disp('Matrix of linearized system:')
subs(A, vars, [xc(3), yc(3),zc(3)])
disp('eigenvalues:')
eig(double(ans))
disp('Matrix of linearized system:')
subs(A, vars, [xc(5), yc(5),zc(5)])
disp('eigenvalues:')
eig(ans)
disp('Matrix of linearized system:')
subs(A, vars, [xc(6), yc(6),zc(6)])
disp('eigenvalues:')
eig(ans)
disp('Matrix of linearized system:')
subs(A, vars, [xc(7), yc(7),zc(7)])
disp('eigenvalues:')
eig(ans)
disp('Matrix of linearized system:')
subs(A, vars, [xc(8), yc(8),zc(8)])
disp('eigenvalues:')
eig(ans)
there are 8 equilibrium points and one of them is negative so we do not care about it . Can you please help me how to plot these as the below graph. any help would be appreciated.

Answers (1)

Mischa Kim
Mischa Kim on 8 Apr 2016
Edited: Mischa Kim on 8 Apr 2016
Raja, you are probably best off to solving differential equations of the system for different initial conditions (and the plot the solutions). You would pick the initial conditions close to the equilibrium points to get the figure you show above. See for example this answer.
  1 Comment
Raja Emlik
Raja Emlik on 8 Apr 2016
the example seems different than mine as mine in 3D could you help me with that please ?

Sign in to comment.

Categories

Find more on Graph and Network Algorithms in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!