Hello!

I've got a question about model integration process.

I've tried to solve quite complex mechanical model and this messages have appeared.

Computing initial conditions...
Iterate re-initialization...
done.
Simulating...
CreateDataRecord: using dsolve method=rosenbrock_dae
Generating configuration 1
Integrating configuration...
Re-initializing after event at t=4.94271387307997e-009...

Hi,

I'm trying to model a magnetic field with maple.

In order to do that, I compute a (huge) sum and integrals of real and posive numbers.

The problem is that for some points, when I compute the norm of this field I get an imaginary number with a very small imaginary part (egs -2, 27293.1844462+1.42305652280*10^(-84)*I ).

How can I get rid of it?

thx in advance 

Can anyone explain this?

> A := Matrix(7, 7, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 0, (1, 6) = 0, (1, 7) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 0, (2, 7) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 0, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 0, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (5, 1) = 0, (5, 2) = 0, (5, 3) = 0, (5, 4) = 0, (5, 5) = 0, (5, 6...

Good afternoon.

I have a problem.

i want ot add the procedure friccion(x1q1(t), x2q1(t), 1) into the dynamic system equation, because the fricction change with the velocity.

I don´t know how can solve that

Please help me o give some ideas.

thank you

30-03-2011-robot-man.mw

My question is very easy I have  and I want   how could I ask this to maple?

In particular my expression is 

Hello.

I can't find a very "basic" tutorial about data file plotting and I have very simple questions.

Assume that we have a file that contains :

0.5 0.2

0.3 0.9

0.4 0.1

0.7 0.6

The first thing to do is to read data. I have no problems for that :

mydata:=readdata("test.txt",2)

Then

mydata=[[0.5,0.2],[0.3,0.9],[0.4,0.1],[0.7,0.6]]

Question n°1

I draw tiles, i want to utilise un plot of an array 2 dimension. But i have had a good solution ?

I input data by hand :

> with(plottools);
> with(plots);

 > a := proc (i, j) options operator, arrow; polygon([[i, j], [i, j+1], [i+1, j+1], [i+1, j]], color = red) end proc; b := proc (i, j) options operator, arrow; polygon([[i, j], [i, j+1], [i+1, j+1], [i+1, j]], color = green) end proc;

Hi everybody,
i'm an italian student, i'd like to create a Maple Library Archive for Maple 11 (a .mla file) with the procedures i want but i don't know how to. Can anyone explain me?

(I want to create a .mla file with some procedures and then recall the library at the initialization of a new worksheet, so that i can use the procedures i defined)

For example, i would like to create a .mla archive with the 2 following procedures:

I'm trying to plot phase analysis for the Friedmann's equation, however when running the protocol and trying to plot these phase analysis, it comes up with error that rho wasn't allowed in the set of options!

Here's the code i'm having difficulty with!?!

> SFsys := proc (lambda, W, ics, T, v, u) local sys, flatF, rho0line, plot0, plotDSp, plotDSm, plotE, flatF_Plot, IC, df1, df2; 

sys := eval(DSys, {Lambda = lambda, gamma = W}); 

> Hello Guys,

Please help me with this problem.

I generate the solutions to an equation and then I place them in a list as for example

> t1 := [((-4*Pi^2-beta^2+4*beta^2*Q^2*Pi^2+8*I*Pi^2*beta*Q)/(4*Pi^2+beta^2-4*beta^2*Q*Pi+4*beta^2*Q^2*Pi^2))^(1/2), -((-4*Pi^2-beta^2+4*beta^2*Q^2*Pi^2+8*I*Pi^2*beta*Q...

Hi , I'm Alan GHafur , I'm student in master dagree in Statistic in Irbil / Iraq .I want learn how can slove non linear function in Maple.

thank you for hlep me.

   The Kolmogorov-Smirnov test is a widespread, simple, and effective test to check the hypotheses of the form H[0]:=F[ksi](x)=F(x), where a function F[ksi](x) is the CDF of a population distribution, a function F(x) is a given continuous function (the Kolmogorov  test), and the hypotheses of the form  H[0]:=F[1](x)=F[2](x), where F[j](x), j=1,2, are the CDF of two population distributions, both are assumed to be continuous (the Smirnov test).  See the ...

In 2D input it is possible to represnet

diff(f,x) as d/dx f

Is it possible to do

diff(f,x,x) as d^2/(dx)^2 f somehow?

Is it possible that we can add or modify new expressions in the palettes?

There are many ways to enter the second derivative in Maple.  Except for some silly reason I am stuck trying to figure out or find out how to enter it in 2d math form. 

d²    f
^---
dx²

Entering it like d^2 (right arrow) f  / (dx^2)  is not the right way to enter it.  What is the right way?