Unanswered Questions

This page lists MaplePrimes questions that have not yet received an answer

my system [u(t),v(t),w(t)] is highly non-linear. I want to understand the local behavior at [u=0,v=0,w=0]. The boundary conditions are as follows: u(0) is given but v(0) and w(0) are not. I want to know if there is a suitable choice of v(0) and w(0) such that the system will converge to the critical point [0,0,0].

Can this system be approximated by a linear system? Or by a two-dimensional system?

Hi all, Is there a feature in Maple to collaborate? I mean: is it possible to work at the same maple file from 2 different computers simultaneously and join the results? It would be great if there's the possibility to work in real-time together, but comparing the files after editing and combining the changes to both documents in one Maple file is already satisfying. Thanks in advance for your advice. Giel
Hi,

How can I plot two boxes with gnuplot in 3 Dimensions, one small box inside one big box? 
I know that it is possible with 
plot3d(Polygon([[x11, y11], ...[xln, yln]], [[x21, y21], ...[x2n, y2n]], ...[[xm1, ym1], ...[xmn, ymn]])
but how can I do with mathematical equations?
 

I have a 3-dimensional dynamic system of ODEs characterized by zero eigenvalues at the origin. I would like to know if it's possible to find one trajectory converging towards the origin.

My system is derived from a control problem and has consequently control-like and state-like variables -- while the neighborhood is typically unstable I need to know if an appropriate choice of initial values can steer the system towards the origin;  I expect at most one such trajectory.

Hello,

I'm try to access some external Fortran routines within maple. I have a Fortran datatype of

  character*255 hf(20)

This is an input parameter, and I believe this will map into a maple Array object, but I'm not sure of the datatype. The help says that the datatype can only be "hardware datatypes" so I take to mean it would have to be of type integer[4]...when I do this I get the error below.

Hello all,

Am a very new Maple user (installed today), so please bear with me! I need urgent help with the following:

I am trying to simulate polymerization of PMMA and have the following problem:

(1) I have Temperature-time data, measured experimentally.

(2) I want to fit my model which gives me a relationship between the rate of change of temperature (dT/dt) and the temperature in terms of a number of parameters:

dT/dt = Q*[Z*{exp(-E/R*T)}*{a^m}*{(1-a)^n}*{1-a}]

where,

a = P/Q + a0

Here,

we have the following:

CM := MultiSeries:-series((c[1]*e+c[2]*e^2+c[3]*e^3+c[4]*e^4+O(e^5))^m, e)

CM := c[1]^m*e^m+c[2]*m*c[1]^m*e^(1+m)/c[1]+(1/2)*m*(2*c[3]*c[1]+c[2]^2*m-c[2]^2)*c[1]^m*e^(2+m)/c[1]^2+(1/6)*m*(6*c[4]*c[1]^2+6*c[3]*c[2]*c[1]*m-6*c[3]*c[2]*c[1]+c[2]^3*m^2-3*c[2]^3*m+2*c[2]^3)*c[1]^m*e^(3+m)/c[1]^3+O(e^(4+m))

Hi all,

 

I am helping a friend.

Please see the two expressions that we would like to convert from Maple into Matlab:

http://yfrog.com/jdexpression3j

 

In the first one, why doesn't Maple first calculate g1^(2/3) and g2^(2/3) as common expressions, then use them to calculate the whole expression?

The (0.1e1/0.3e1) stuff looks very bad.

 

In the second one, we just couldn't get Maple to cancel the common factor g1^(2/3) in both numerator and denominator before doing the conversion to Matlab.

I have this code and to test if it works in TextField1 next to the label "MATRIZ A" I enter

Forgive my ignorance here but let say we have some data that I want to

model with some partial differential equations. What would be most efficient way

to come up with the specific equations inorder to be able to calibrate such system ?

I guess I could just calculate the partial elasticities and deduct some relationships from that

but there has to be a more beautiful approach ?!

hi

can you help me "i need maple code to solve poisson equation by multigrid method"

thanks

 

Hello, I've recently started using maple 13. I am working on a project for school where I am attempting to use several independent variables to try to predict a single dependent variable. The nature of the project is that there is currently no known answer, and therefore I have been using regression analysis through maple on each individual independent variable on the dependent variable. I was difficult to find a way to preform a goodness of fit test on the data through maple, but I eventually saw a way on this site to compute the R^2 value.

I need help on turning this code into a procedure and what changes do i have to make  so it works like the gauss-seidel algorithm. I have tried many times on my own but can't seem to get my head around it. Any help would be appriciated greatly.
 

 

First of all: I'm so sorry, I posted my question to a wrong place ( into the poll).

So I copy here the question and the answer of jakubi and my reply to jakubi.

Question:

I would like to solve the following system

x*(2*sin(x)*y^2+x^3*cos(x)+x*cos(x)*y^2) = y*(2*sin(y)*x^2+y*cos(y)*x^2+y^3*cos(y)),

-x*sin(x) = y*sin(y);

Until I have founded only the solutions

x = k*Pi,  y = +/- k*Pi;    k is any integer.

jakubi's answer:

more solutions

How can I get Maple 10 Standard Worksheet to plot with vertical logarithmic axis having the gridlines at 10,10, and so on, in a vector graphic file like eps?

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