There is a set of non-linear equations solved at each time step for a differential equation..how to implement this in maple.

A typical scenario would be tyre models for vehicle dynamics applications.

help in this regard would be appreciated.

Raja Amer Azim

Hello,

I have what may or may not be a nasty equation for the structure constants of a particular algebra I would like to classify.  Said equation looks like:

 

f^{0ij}_{\rho}*f^{\sigma\alpha\rho}_{\beta}=f^{\sigma\alpha0}_{\rho}*f^{\rhoij}_{\beta}+f^{\sigma\alphai}_{\rho}*f^{0\rhok}_{\beta}+f^{\sigma\alphaj}_{\rho}*f^{0i\rho}_{\beta}

 

hi

I'm dealing with an expression involving terms like:

( a * x ^ l * y ^ m * z ^ n ) + ( b * x ^ p * y ^ q * z ^ r ) + more of the same. The powers can add up to order <=8 [ for example  l + m + n can add up to 8 or less ]

How do I "ignore" terms in my expression where the powers add up to more than 4 ?  [ I know that these orders of magnitude can be ignored ]

I'm trying to use "collect" but can't see how to do this yet.

many thanks

Peter

 

 

 

 

To anyone out there who may be able to help

I have been researching into closed-form solutions of the 2 x 2 case of the Matrix Differential Equations

dM(s)/ds = [ M(s) , D(s)/2 ]   ,    M(0) = Mo in sl(2,R)  ( 1 )

dD(s)/ds = [ M(s) , K(s) ]      ,     D(0) = Do in sl(2,R)  ( 2 )

dK(s)/ds = [ D(s)/2 , K(s) ]    ,    K(0) =  Ko in sl(2,R)  ( 3 )

hellow!

my maple 11 recently isn't working, i mean with double click not only is not working,

but also after i removed it, setup also is not working.

whats the problem? is it of virus?

 

diff(u(z),z,z)=g*S/Az        (Barotropic pressure gradient vs friction equation)      where S=Diff(eta(x)) or surface slope

bc=Az*D(u)(z)=0,Az*D(u)(-H)=tau/(Az*rho)=Cb*u^2(z)/Az

how can I solve and plot the for different depth z=-20 to 0

and Az=0.0010,Cb=0.0025,S=-0.000001

 

 So how can I find the u(z)

and plot the graph of u(z) (velocity) against z (depth)

 

 

 

 

 

 

Helo,

I woud like to read commands from a text file, that contains both expressions in Maple syntax  and  other  things too.
The following example is a simplified version of my problem.

The first example works as expected, it gives a vector of random data :

parse("Statistics:-Sample(Statistics:-RandomVariable(Normal(0, 1)),100)",statement) ;

The following line doesn't work for me (Maple 12), i. e Maple doesn't evaluate the Sample command.

I've just created a very long document.  Without having to scour the entire document to see what expression I've assigned to a certain variable how can I recall my original expression after I've assigned values to the variables in it?

It would like to decide the following integral, however with the function int I did not obtain. The integral is the following one

 

int((exp(1/sqrt(2/delta)^2)/((t+delta*mu/(delta+1))^2*(2*sqrt(2/delta)*sqrt(2*pi*delta*mu/(delta+1)))*t^(3/2))*(t+delta*mu/(delta+1)))*exp(-(t*(delta+1)/(delta*mu)+delta*mu/((delta+1)*t))/(2*sqrt(2/delta)^2)), t = 0 .. infinity)

 

with delta>0 , mu>0.

 

I am thankful anticipatedly

 

Manoel Neto

<p>I running Maple 12. I don't see what could be wrong with the specified initial values for this nonlinear fit problem. Note error when initial vlaues are specified, and no error without initial values.

Hi, I'm really new to maple and I'm trying to learn how to do few basic things. I have sequential files 1740.tmp, 1741.tmp, .... 1770.tmp. and each file contains 12 float numbers: 0.400 0.324 0.232 . . . 0.342 what I've done so far is the following: L := [seq(i, i = 1740 .. 1770)] filename := cat("/Users/humadih/test/", L, ".tmp") > Y := readdata(filename, 1) and it's giving me this error: Error, (in readdata) expecting a file name or descriptor I can get rid of this error message if I put one file name like: > Y := readdata("/Users/name/test/1741.tmp", 1)

I am trying to solve a problem of liquid-liquid equilibrium based on the gibbs free energy equation:

DGdef := DG/RT = sum(n[i]*ln(phi[i]), i = 1 .. nc)+sum(sum(X[i, j]*n[i]*phi[j], j = i+1 .. nc), i = 1 .. nc)

DGdef1 := subs(n[i] = phi[i]*V/v[i], DGdef)

DG := eval(rhs(DGdef1), nc = 3)

Somebody named Alec have gave me this programme after he modified my old programme.

I am having trouble trying to perform some of the computations listed in the Maple Advanced Engineering Mathematics E-book.  I directly copy and paste the text into my worksheet but Maple does not compute the answer as shown in the e-book.  It simply rewrites what I copied in a different format.  For example I'll write:

simplify(CrossProduct('A' , 'E') ) ;

Instead of computing the answer it just rewrites my input in a differnent way like this:

=CrossProduct((cos(p)-psin(p),-2sin(p)-pcos(p))

Dear Experts,

I want to solve 2 workssheets with NPL Solve with Maple 12.

But how is it done? In worksheet 1 I always get this error. Unless I have solved this worksheet one err I can not continue wrking on worksheet two.

Thnaks for help

Walter