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HI everyone, im currently using maple 15 and im trying to animate at least the mass of my pendulum. My problem is that the  coordinate of each mass would be the solution of two numerical ODE and I can't animate this. I am able to plot the solution of my ODE (wich correpond to the two angle in the pendulum), but when it comes to animating... its an another piece of work. So here is what I tried: the code would correspond to the animation two masses... no rope yet.



I'm trying to plot a few phase portraits for this four equation system but maple wont let me...

> restart;

> s := 10; d[T] := 0.2e-1; k1 := 2.4*10^(-5); k2 := 3*10^(-3);
> N := 5; delt := .24; c := 2.4; T0 := 1; 


Can someone please help me? Thanks


Hi everyone, im trying to solve the following system of ode (motion of a double pendulum) where im trying to plot numerical solution for T1(t) and T2(t). Been searching for a while... found nothing :) Here is my code , i also loaded the library plots, DEtools. . Im using maple 15

> Systeme := [2*(diff(T1(t), x, x))+cos(T1(t)-T2(t))*(diff(T2(t), x, x))+sin(T1(t)-T2(t))*(diff(T2(t), x))^2+19.6*sin(T1(t)) = 0, diff(T2(t), x, x...


I have to  solve following ODE set as a part of my MsC thesisr^2*Hr[r, r]+(r+(1/2)*r^3)*Hr[r]+(r^2-4)*Hr+2*R*(1-exp(-(1/4)*r^2))*Hi-(1/2)*R*r^2*exp(-(1/4)*r^2)*Sii-(1/8)*R*r^4*exp(-(1/4)*r^2) = 0



Can someone please tell me why I am getting this error (in bold):

> ODE := diff(y(x), x)+3*y(x) = x^2
> ics := y(0) = 1

> dsolve({ode,ics})

Error, (in dsolve) not an ODE system with respect to the unknowns {y(0)}

How to draw slope field associated to differential equation: dy/dt = sin(ty) on Maple software?

Firstly applogies for if this question has been asked before.

I am trying to plot a simple epidemic model for where I can change the rates.

My equations are:

de1:= diff(X(t),t)=a*X(t).Y(t);

de2:=diff(Y(t),t)=a*X(t).Y(t) - b*Y(t);

where X is susceptibles and Y is infected.

I would like to be able to produce a graph with the susceptible and infected plotted. Where i can change the initial conditions of X(0) and Y(0) using sliders...

One of my friends would like to buy a book about solving multiple integrals and/or ordinary differential equations with Maple (some newer version, let's say 13 and newer).

I know about this site:, but can anyone recommend some book(s) which is (are) worth buying?

Hello experts in Maple,

I'm going to solve IVP numerically by this command bellow:

dsys1 :=diff(u(t),t)=-(Gamma+AM*cos(q*t+phi))*u(t)+(Delta-AM*sin(q*t+phi))*v(t)+Omega*w(t), diff(v(t),t)=-(Delta+AM*sin(q*t+phi))*u(t)-(Gamma-AM*cos(q*t+phi))*v(t), diff(w(t),t)=-0.5-2*Gamma*w(t)-Omega*u(t):
dsol1 :=dsolve({dsys1,ini1},numeric,method=lsode,var, abserr=1e-9, relerr=1e-8,output=listprocedure):


I am trying to do a do loop that solve ODEs with initials conditions but i am having problems asking my do loop to use what we get from first run to run the secound one.

For example:

for i from 1 to 10 do




end do;

so first when i =1 we get a b and c then for i=2 we want what we get from i=1 to do i=2 and so on. 

Is it possible to do such a do loop? to ask maple to save what it get from...

code efficiency...

February 22 2012 ABond 30

Dear all,

Some time ago I asked a question concerning the algorythm for numerical dsolve and related issues here.

I got a nice answer from pagan and implemented the algorythm.

However, since my system is big, the iterations take long time.

Here is the code itself:

> sys2:=[TRIC[4],TRIC[5],TRIC[6],TRIC[10],TRIC[11],TRIC[12]]:
> GRAD:=subs(u=FF[1](t),a=FF[2](t),k=k(t),tau=tau(t),psi[1...

I am trying to model a multibody system using euler lagrange equation. There are 3 links in the system attached with each other by revolute joints. The first link has one end fixed with the revolute joint.

Length of links= l1,l2,l3

Angle with x axis=Theta1,Theta2,Theta3

Mass of links=m1,m2,m3

Moment of Inertia = M1,M2,M3

I am not able to find the solution of ODE system comprising of 3 ODEs which I get after solving Euler Lagrange Eq for...

Dear all,

I am stuck with my gradient projection algorythm. I asked several questions on this but nothing helped.

So, the basic problem I have is the following:

I need to make a procedure, which would take as an input some function of time, x(t),

calculate numerical solution for the ODE system


via dsolve/numeric

then update the value of the function x(t)=f(y_1(t)),

giving as a result x(t...

I converted an ode using the built-in "convert" tool to check some calculations I had done by hand. To my surprise, there was an inconsistency. I converted the ode using PDEtools[dchange], reproducing the steps I had followed manually, and they checked out. So my question is: is there a sign error in convert? (and therefore a bug) or are both conversions correct, and if so are there any lessons to be learned? (is it related to the equation's symmetries?)

Thanks for your comments.

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