Unanswered Questions

This page lists MaplePrimes questions that have not yet received an answer
Hello every one,
I got an error while trying to solve numerically a nonlinear system of odes using 
the dsolve command. This error is very common,
"Error, (in dsolve/numeric/bvp) initial Newton iteration is not converging".
I tried the different technique explained in 
http://www.maplesoft.com/support/help/Maple/view...

restart:with(plots): a := 1; b := .5; d := 1; omega := .4; h1 := 1+a*cos(x); h2 := -d-b*cos(x+omega); F := Q-1-d; de:={alpha*(diff(f(y), y, y, y, y))+G*(diff(theta(y), y, y))+B*(diff(phi(y), y, y)) +6*beta*(diff(f(y), y, y))*(diff(f(y), y, y, y))^2+3*beta*(diff(f(y), y, y, y, y))* (diff(f(y), y, y))^2 = 0, diff(theta(y), y, y)+Nb*(diff(theta(y), y))*(diff(phi(y), y))+Nt*(diff(theta(y), y))^2 = 0' diff(phi(y), y, y)+Nb*(diff(theta(y), y, y))/Nt = 0, f(1+cos(x)) = (1/2)*Q-1, f(-1-.5*cos(x+.4...

This question was asked before but because of the curiosity, I 

bring it in the light again. We have a system of odes

restart:with(plots):

a := 1; b := .5; d := 1; omega := .4; h1 := 1+a*cos(x); h2 := -d-b*cos(x+omega);

F := Q-1-d;

de:={alpha*(diff(f(y), y, y, y, y))+G*(diff(theta(y), y, y))+B*(diff(phi(y), y, y))

+6*beta*(diff(f(y), y, y))*(diff(f(y), y, y, y))^2+3*beta*(diff(f(y), y, y, y, y))*

(diff(f(y), y, y))^2 = 0,

Find the definition Of the word juxtaposition in a dictionary and explain its meaning in the context of the tutorial?

I created a triangle whose length of the medians are integral numbers. Please comment to me about my code.

> resrart:

ListTools[Categorize]:

N:=5:

L:=[]:

for x1 from -N to N do

for y1 from x1 to N do

for z1 from y1 to N do

for x2 from -N to N do

for y2 from -N to N do

Hi people!

I'm experiencing lags of about 45 seconds on the interface when trying to manipulate the blocks of my model. MapleSim becomes totally unresponsible when, for example, I make a new connection. It just happens with this model.

Curiously, when I disable an specific connection, I can manipulate the model with reduced (but yet present) lags.

For instance, my processor is an Intel Core i5.

Could someone take a look at it? I will upload the model on demand.

Hi there!

Is there a way to implement a fixed delay (not the Padé approximation)? I'm using MapleSim 5. 

I tried importing the Modelica's fixed delay block, but it seems that MapleSim doesn't support the implementation...

Thanks! 

Hi people!

Why there is not a "Modelica.Mechanics.MultiBody.Joints.RollingWheel" (different from 1-D mechanics rolling wheel) in MapleSim 5? It is previewed in the Modelica language and SystemModeler has this implementation.

Is there a way to import the model o this joint from somewhere? If not, how could I model this non-holonimic constraint in MapleSim? 

Thanks! 

Hello,

I want to build a paper model of an immersion of real projective plane made out of paper strips. I want to use maple to plot the curves which represent the paper strips. I have written a code shown below which computes the curve for one of the strips. In this code, alpha is set to Pi/2 and the computation goes through. However the computation should be performed for various alpha. But if I set alpha=0, then f (see code below) is not computable, if I set alpha=Pi/4,...

Hi there.

 

I build a costum component on maplesim. It has 2 inputs and several outpus, like this:

 

As you cant see i get an error. At this simulation the constant where is probe1 is k=4. I have good results if n=2-~3.5. But what is strange is that if instead of a constant input n=4, i use a...

A user recently sent to me a Maplet that includes the display of an array of plots. This maplet works fine when run under the classic interface but not under the standard interface. As I tried to understand this problem I believe I have narrowed it down to a difference in the way the classic and standard interfaces handle an array of plots.

The attached worksheet is a very simplified example that shows the problem. What should happen is that pressing the "Plot single" button should show a single graph, pressing the "Plot array" button plots the empty axes, and pressing the "Plot displayed array" button displays a 2x2 array of plots. The second and third buttons illustrate the need for "plots:-display" in the action definition for this button.

Unfortunately, this works only in the classic interface. In the standard interface the "plot displayed array" button does not display anything. I should add that it appears to work correctly when exported as a .maplet file and run with the Maplet Viewer.

I have uploaded the worksheet: PlotArrayMapletDem.mw

I'm trying to compute the rank of large, non-quadratic matrices modulo p=2,3,5 and 7.

For matrix-sizes of (approx.) 20000 x 20000 everything works fine with Rank(p,M) of LinearAlgebra[Modular].

But for (approx.) 40000 x 40000 even the parsing of the matrix is not finished after 5 days (for 20k x 20k this takes 1 or 2 hours) . The system I use has enough ram, so no swaping is involved.

 

First question: I expected the parsing to be O(n^2), why is this not the case?

In matlab, a function is returned a structure H, say H.a, H.b, ...

In maple, I want to call this matlab function, but what returned to maple is a Record:

 

Hs:= getvar("H");

Hs:= Record(a=..., b=..., ...);

 

So how can I convert this record to a normal maple array? so I can access to each element by Hs[1]. 

 

Thank you

Kyle

Hi there, I'm trying to pass some calculation to Matlab then retrive the result by getvar(), but seems something is getting wrong.

my matlab function is very simple:

 

function out =maple_fun(a, b)

out = a + b;

return

 

this function is saved as maple_fun.m.

 

in Maple,

restart:
with(Matlab):
openlink():
DirectoryLocation := " cd  '/Users/Kyle/Documents/MATLAB/'  ":

Useing the following procedure I'd like to collect a set of  roots in a list of lists, so they can be manipulated and presented in various plot options. Some of which could be very interesting (to me only perhaps).

One option is to create a loop which produces values of newton roots x0 for a given function. For example:              f:=x->(x^7)-5

for x from -1 to 1 by 0.05 do

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