Linked Questions

2
votes
3answers
5k views

Phase space vector field [duplicate]

I have a system of non linear equations and from NDSolve I get the solution. I plot the phase space with ...
5
votes
2answers
193 views

Phase Portrait for ODE with IVP

I'm trying to make a phase portrait for the ODE x'' + 16x = 0, with initial conditions x[0]=-1 & x'[0]=0. I know how to solve the ODE and find the integration constants; the solution comes out to ...
2
votes
2answers
790 views

Plotting geodesics of upper half plane

I want to solve (numerically) the geodesics of the upper half plane and plot. The results are quite known (i) straight lines parallel to $y$-axis and (ii) semicircles centered on the $x$-axis. Now the ...
0
votes
2answers
171 views

How to plot the phase portrait of a second-order differential equation?

I am relatively very new to mathematica, but I have been trying to figure this out for hours. I have a second-order differential equation, $$ ay''+by'+cy=0 $$ and I have converted it into a first-...
8
votes
1answer
3k views

Rosenzweig-MacArthur predator-prey model [duplicate]

The predator-prey model is governed by the following system of ode's. \begin{eqnarray} &&\displaystyle{\frac{dx}{dt}=r x\left(1 - \frac{x}{K}\right) - \frac{s y x}{1 + s \tau x}},\\[0.1cm] &...
3
votes
1answer
835 views

How to plot Van der Pol equation's limit cycle? [duplicate]

The Van der Pol equation is $$y''-\mu (1-y^2)y'+y=0, \,\, \mbox{where}\,\, \mu ≥ 0. $$ Use the Runge-Kutta Method to plot the limit cycle and some solutions in the phase plane (the $yy'$-plane) ...
3
votes
1answer
730 views

Is there a Mathematica version of ODE tools pplane and dfield?

The toolkits dfield and pplane are staples in ODE courses. First in MATLAB, now in Java. Do they have a Mathematica expression? Sample outputs follow: @Michael E2 Your suggestions were great. Here ...
2
votes
1answer
1k views

Plotting simple ODE system phase portrait [duplicate]

I am new to Mathematica, please help me to handle the following problem: I have the following system of equations: \begin{cases} \dot x = 2xy \\ \dot y = 1 - x^2 - y^2 \end{cases} What I want is to ...
2
votes
1answer
447 views

Projection of a 3D ODE solution on a parametric 2D streamplot

Problem I have a third-order dynamical system of which I'd like to plot the solutions on the streamplot defined by the same dynamical system, as a function of one of the three variables. These are ...
1
vote
1answer
177 views

Phase portrait plotting

I'm trying to plot a phase portrait for the equation: (d^2/dt^2)y + b * (dy/dt)^2 = A, A > 0, b < 0 The first thing I did was changing ...
1
vote
1answer
649 views

How can I create a phase plane? [duplicate]

I want to make a phase plane for an equation system. I want it to look something like a Mu-Space in Stat-Mech. Basically I want it to show the same system with various different initial condition ...
1
vote
1answer
4k views

How can I draw this particular phase diagram in Mathematica? [duplicate]

Sketch the phase diagram for systems with the following velocity functions where a and b are constants with ...
4
votes
0answers
188 views

EquationTrekker-like behavior for state space?

EquationTrekker is great for phase space plots, however I want to plot the results of $$\phi '(t)=-b \sin (\phi (t))+g \sin (\Phi (t)-\phi (t))+1\\\Phi '(t)=g y \...
2
votes
0answers
224 views

How to use mathemtica to plot phase portraits?

My question stems from exercise 4.3.3 in Murdock's book "Pertubations: Theory and Methods". I am asked in the following: Consider the problem $y''+y=\epsilon y^2$ $y(0)=\alpha$, $y'(0)=0$. Draw ...
1
vote
0answers
33 views

Global phase portrait [duplicate]

How to use Mathematica to draw global phase portrait that reflect critical points at infinity to Poincare sphere equator with all trajectories shown.

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