Help me, thank a lot

I am looking for help with basic algorithms to approximate numerical solution to the N body problem. I have been trying to develop basic algorithms using Runge Kutta, Euler ect. Initially I specified to the 3 body case and the equations of motion. I am now trying to develop a more general algorithm. If anyone has knowledge in this are or can look through my annotated procedure to see where I have gone wrong I would appreciate it. I am very new to maple and would appreciate detailed exposition, "for dummy's", if you will. Thanks in advance

Hello,

I am wrting my thesis which is on some MapleSim models. In Ref I introduce MapleSim, I wanna know if MapleSim has Document Object Identifier (DOI) number or name that I can refer to.

Thanks so much,

Bye

Hello, recently I am working to write a bash shell program combined with maple to automatically produce the codes to calculate functional and functional derivatives values for some given functional expression(This is provided by the user in maple input file). Now I meet a problem.

Take the codes below as an example:

I tried the following:

restart;
with(Statistics):
X1 := RandomVariable(Binomial(n, p)):
DARA := t->piecewise(0<t,log(t),0):

0 < n, n::posint, 0 <= p, p <= 1:
 

ExpectedValue(DARA(X1));                                        
g1 := simplify(%) = DARA(s);
k1 := solve(g1, s);
 

Hello, In maple, I am defining a differential equation similar to: (x^2)*diff(y(x), x$2)+x*diff(y(x),x)= a cubic in y(x). When I try to solve this using dsolve, numeric, I receive some form of memory error, stating that something small*I cannot be stored in datatype = float[8]. Sorry this isn't too specific - if you need more info or the boundary conditions, or perhaps the error message word-for-word, I'll reply with it when I get to my other laptop. Thank you very much for your help in advance, Marc

Hey guys i am currently attempting to do some modelling with maple, i need to solve a PDE system, i am using the following code and am confused with the error i'm getting. restart: M[Star]:=2*10^30: M[planet]:=2*10^27: q:=(M[planet])/(M[Star]): g:=sqrt((R-a)^(2)): H:=0.0333*R^(1): Delta[p]:=H: Alpha := unapply(piecewise(R <> a, 6.67*q^2*10^(-11)*M[Star]*(a/Delta[p])^4/(2*R), R = a, 1), R, a)

How do I select multiple non-contiguous lines of text (or math).  I have tried cntrl-slect, shift-select, anything I can think of -select with no success.

Thanks in advance.

Hello! I have a problem - i can't find standart Maple functions and procedures, that plot, so to speak, "phase portrait"-esque magnetic field lines for featured "vector field". In details: i need to plot magnetic field lines and equipotential curves of uniformly magnetized cylinder. I have piecewise functions Hr(r,z) and Hz(r,z), (per se, r is x, z is y, y-axis coincides with cylinder axis): L := 2; a := .5

Hi

Does anyone know how to export surface plot with multible surfaces to a file format that can be easily plotted using matlab?

Thanks in advance

Regards Brian

Has anyone used MapleSim to coordinate with Matlab/Simulink Model for the purpose of making their autocode the most effiecent?  I belive from  a webinar I watched something like this could can be an application of MapleSim.  I'm curious if anyone  has used it for that purpose?  If so, what were the challenges/benefits? Did you save in embedded memory needed (i.e. smaller autocoded files) or shorter proccesing time measured? 

Hi,

I'm using MAPLE 13 on Mac OS X 10.5.8 with a "French keyboard".

Suppose I set

a:=plot(x^2) or some other complicated expression, but just for simplicity sake

Then I go ahead fill up a worksheet then change the a to b in the same line and alter the expression for variable b (because I didn't want to type out a new line for the variable)

How do I recall what I've set a equal to? 

eval(a,1) - just returns the plot and    print(a,1) - returns PLOT(...),1

I think there's a way but I can't recall.  Can someone point me in the right direction?

A small glitch

with(plots):
pointplot3d({[2,3,4],[1,2,3],[4,5,6]},symbol=box,axes=boxed)

The third point is missing from the plot however if I use axes=normal all three points are displayed but when the boxed option is enabled the point [4,5,6] is not displayed. 

It seems the autoscaling undercuts the last point and so is out of view of the plot.  In order to have the 3rd point visible (it is there) we need to use the view=[ xmin..xmax,ymin..ymax,zmin..zmax ] option.