Hi All,

I am trying to apply a learning algorithm to a pendulum. The algorithm has Modelica custom components and also MapleSim custom components. I need to reinitialize the simulation  (i.e new initial states for the pendulum) without stopping the simulation. I think I have to use a Modelica custom component since there is a "if" condition and there is a function called "reinit()" in Modelica, but I am not sure how this works...

if you have...

Hello.

for one of my projects I require to solve differential equations I have obtained from an euler-lagrange system.

I solved them and obtained values of angles and their derivatives as listprocedures. I want however to be able to calculate values for different speeds noted as vx2 and vy2 as well as the angle of the speed verctor wich would be in that case arctan(vy2/vx2). It doesn't seem however that maple is going to do that. It gives me a pretty huge message...

I am fairly new to Maple and trying to understand the dsolve command for numerical solutions and plotting graphs of radial distances and trajectory plots.

This is my code below. All of it successfully brings up a solution apart from the very last command and I don't understand why it is not working. 

I believe the last plot is plotting a trajectory plot but I am not sure. I am meant to use the solution to plot the trajectory plot (X(t),Y9t))=(r(t...

Hi everybody:

was wondering if someone could help me figure out what change took place in Maple 16 so that the expression shown below does no longer work

A:=a->Matrix(2,2,[[a,3*a],[a,4]])

It worked OK until 15

thanks

karamand

I want to find the diffrential equation of

Given a vector with six elements called, say, c, how do I assign the sum of its values to a name called d without having to write d=c[1]+c[2]...?

Thanks in advance.

Find the value of the integral I=∫√(tanx)dx

The following is a differential equation with separable variables.  It is solved with dsolve and "manually".  Why is the dsolve solution so complicated?

Ratch

Find the value of the integral I=∫√(sinx)dx

I'm now using Maple 15 to get derivative funtions in a function with multiple parameters. So I want to find out the derivative w.r.t just one parameter. In the forum, I found out one way to solve this issue. 

In order to prove the correctness of the function D[3](m,n,p,r,x), I firstly use a very simple program to test it. 

In the Engineering PoA-Example.mw file, I've used a simple function called testFor with 5 parameters to generate a mathematical...

Hi everyone,

Here is the code:

Ralpha:=sqrt(d)*IdentityMatrix(2):

alpha:=Array([WienerProcess(Ralpha),WienerProcess(Ralpha),WienerProcess(Ralpha),WienerProcess(Ralpha)]):

alpha1:=k->Vector[column]([[alpha[1](k)[1]],[alpha[1](k)[2]],[alpha[2](k)[1]],[alpha[2](k)[2]],[alpha[3](k)[1]],[alpha[3](k)[2]],[alpha[4](k)[1]],[alpha[4](k)[2]]]):

Finance[ExpectedValue](alpha1(0)[1]*alpha1(0)[1],timesteps=100,replications=10^4);

----> 

I have a rather large multivatiate polynomial "Dtest"  I need to divie it by a cubic poly "DGm" using rem and quo. Both are determinants multiplied out,  both given below. Have spent the past 2 nights trying to sort, collect, expand, equate coefficients plex groebner etc. Am trying to collect up all the powers of c₃ but cant anything to work. even expand doesn't fully expand "Dtest". If I set c₁ and c₂ to 1 things are...

Hi guys

Is there any build-in function which converts [[x>5, x<10], [x < 0]] to "x>5 and x<10 or x<0"? I've written my own function, but I want something build-in.

Thanks :)

Hi everyone,

Working on my project, I have this error "Error, (in VectorCalculus:--) too many levels of recursion".

The project is about filetring a stochastic process.

When I want to calculate one of the integrals, I have that error.

Here is the code:

Rxi:=sqrt(d)*IdentityMatrix(4):

xi:=WienerProcess(Rxi);

Reta:=sqrt(d)*IdentityMatrix(2):
eta:=Array([WienerProcess(Reta...

Hi, I am trying to solve the following differential systems using dsolve numeric but there is something wrong with my code.

I am fairly new to Maple and cant work out why it is telling me that it doesnt work. COuld somebody help me?

DifferentialSystem := {diff(r(t),t$2)-r*(diff(theta(t),t)^2=-1000/r^2 ,
                            r(diff(theta(t),t$2)+2(diff(r(t),t)*(diff(theta(t),t)=0,
                            r(0)=sqrt(65), theta(0)=1.446...