Hi! I need help with my project I dont know where to even start!

Question:

Consider a simple polymer , which consist of long chains of simple molecules attached to each other, e.g:

....-CH₂-CH₂-CH₂-...

If the interaction energy between consecutive sections ca be ignored or is low enough, the chain can be bend around at varios places to form varios configurations. One can start by  fixing the first section...

i found this program in mapleprimes 

Hello! I am trying to graph the following: 

dx/dt = -10*x + 10*y 
dy/dt = r*x - y - x*z 
dz/dt = -(8/3)*z + x*y 

where x, y, and z are all functions of time (t). Solve the equations subject to the constraint that r = 25 and the initial conditions that at t = 0, x = -1, y = -1, and z = 1. 

This is my code:
DE*plot3d({d*x(t)/dt = -10*x(t...

Hi everyone 

Is there a method in maple to plot a rectangular matrix.

Amr

Hi,

I am trying to proof that the right hand side is equal to the left hand side. When i do step by step, it clearly shows that my "c" and "d" are exactly the same thing. But when i use "evalb" and "verify", it comes out with "false". May I kwow what went wrong please?

Thanks.

See my code:

----------------

restart;

with(plots); with(PolynomialTools); with(LinearAlgebra);

f := (x, y) -> ((2*x^2+y^2*(x^2*(-2+sqrt(1/x^4+4/(x^2*y^2)+4/y^4+4))-1))/(4*x^2-2*y^2+4))^(1/2) ;

g := diff(f(x, y), x);

plot([g(.1, y), g(1, y), g(3, y)], t = 0 .. 10);

-----------------

Here is error message:

Warning, unable to evaluate the functions to numeric values in the region; see the plotting...

Hi,

I have a simulation file consisting of a number of modelica custom componets and maple custom components. I initially generated Random Data with mean 1 and standard deviation 0.5. Constructed all the blocks and combined with a multibody system, it worked fine. However, when I generated Random data with zero mean, then I have this error/problem "Simulation Problem: maximum number of event iterations reached (100) at 1.85000".

I used a couple of pre() function with clock=sample(0,0.01...

Hi.

I can explain my question on the simplified example:

sol1 := dsolve({diff(x(t), t) = x(t), x(0) = 0.0}, numeric); 

func := q -> op(2, op(2, sol1(q))); 

dsolve({diff(z(t), t) = func(t) * z(t), z(0) = 0.1});

But i take a throw. It is clear, because, I try to call op(2, sol1(t)). Which way I whould use to solve my problem?

Hi, I have a 4x4 matrix

How can I arrange it diagonally and make it into 3 repleating matrix? I'll get a 12x12 matrix, with the middle representation having negative values?

For example,

A:=Matrix([[2,2,8,5],[6,3,4,9],[5,5,7,4],[2,1,3,2]]);

I am trying to get something like B:=DiagonalMatrix(A,-A,A);

May I know what is the correct way of doing it please? Thanks.

Dear everyone,

  Hello,

  I have a stupid question. From

http://www.maplesoft.com/support/help/Maple/view.aspx?path=examples/string

  There are many examples about "" '' `` related to character string (let me call it in this way for a moment )

  Actually what is the precise difference between these symbols?

Thank you very much in advance

with best regards

Dear everyone,

  Excuse me, I made some editing work witn the result of maple in editplus, then copy the editplus result to maple. Then I received several ">"

E.g.

f1:=2;
f2:=3;

copy to editplus then copyback to maple, it becomes

>f1:=2;
>f2:=3;

I have to "shift+enter" in maple to create new lines without ">", then copy the content of one line with ">" to the new created line without ">".

Hi,

I'm trying to creat u which is a function of ξ. but I do not have the full definition of u yet. how can i write it in a way where when i differentiate it, it'll give me something like u(ξ),_ξ? And that i can differentiate it once more with ξ and it gives me u(ξ),_ξξ and so on?

please advice. Thanks.

Hi I have a problem with the resolution of an equation. When I tried to solve it it returns "solutions may have been lost"... Here is the problem:

restart:with(Statistics):
> x:=rand()/10^12;

                               197859430267
                          x := ------------
                               500000000000

> X:=RandomVariable(Gamma(2,4));

                               X := _R

> XL:=RandomVariable(ChiSquare(3));

I've the equation

(-x^2+eta^2+2*x*xi+2*x*eta-xi^2-2*xi*eta-2*x*y-2*y*eta+2*xi*y+y^2)*(-x^2-2*x*eta+eta^2+2*x*xi+2*xi*eta-xi^2+2*x*y-2*xi*y-2*y*eta+y^2)-(x-xi)^4+6*((x-xi)^2)(-y+eta)^2-(-y+eta)^4

The answer is 0

But I can't get the answer by simplify and expand

Then which .Thanks