I have an animated spacecurve with arrow:

restart:with(plots):

p4:=animate(arrow,[<cos(tend),sin(tend),0.9 tend>,<-cos(tend),-sin(tend),0>,color=red],tend=0..50,axes=boxed,frames=150);

I succeed in putting text at basis of arrow:

l3:=animate(textplot3d,[[cos(tend),sin(tend), 0.9 tend, 'basis'],color=black,align={BELOW},font=[TIMES,ROMAN,14]],tend=0..50,frames=150);

I like tot put text at the end of the arrow. This is my 'progress':

Hello evrybody,

my first question here.

i'm a engineer studend in electronic and i'm working on the inverted pendulum problem at my university.

so i need to use the lagrange way to get my equations in the good form.

i have this equations :

Hello,

I have a plot of a cylinder with points singled out.

Firstly, the points are currently given by (x,y,z) but I would like them in terms of (r,θ,z), how can I do this?

Secondly, I was wondering how to assign to each point an [i,j] value? So you could have r[i,j], θ[i,j] and z[i,j] as matrices of the points?

Points_on_the_initia.mw

Maple is saying 'Error, Vector index out of range'. Can you see how maple executes all steps, so I can see where exactly the problem is?

http://www.maplesoft.com/applications/view.aspx?SID=33040&view=html

it can calculate from numeric data, is it the end?

where do multiset coming from?

if given a multiset, and calculate its power sums, then i express this power sums in terms of symmetirc polynomials, what is the purpose of this?

I often have to create density plots with many (thousands of) points. Hence the first thing I do when I install a new version of maple on linux, is edit dir_of_maple/bin/maple so that

JAVAHEAP=512

is instead

JAVAHEAP=4096

I have done this for years and never have any memory problems. But recently I have sent my code to someone who runs Windows and they seem to have "out of memory" issues when trying to do density plots of large datasets.

Hello,

I am trying to modify Maple code so I have a vertical spring with a mass starting at (0,0). The spring with the mass should move right and left along x. My vertical spring move up instead of down while the mass move to the right .

Any Idea about how I can get the right movement of the spring?

Please ignore the equation eq since I am only trying to have an animation spring with a mass.

 Thank you

Hello

I've to do some geometric work ; the problem is that it seems to me there will be no other solution than trying a different approach of the problem, due to huge amount of time required by computation...

However, I would have liked to learn how my program can be fastened. I've heard of multi threaded programming model ; could it be applied here ?

To simplify, I have a initial point (its coordinates). My procedure...

I just bought Maple 17 and tried to find a couple of Newman-Penrose spin coefficients.  I can do it by hand, but when I try to do the same thing using Maple I am stuck.  Maple lets me define an orthogonal tetrad, then I convert that to a null tetrad.  But how do I then fiind spin coefficients?  I know Maple has an entire list of metrics (385) already loaded, but I need to investigate different Petrov types to develop a metric.  Thanks.

I have a message, "I Didn't See That Double Rainbow!" and i want to encrypt it by making all the characters UpperCase first and removing all punctuation. I used IsUpper to remove the punctuation. Now I want to separate my new scrambled message into BLOCKS OF 5 LETTERS SEPARATED BY SPACES. Any ideas on how to do that using the "printf" command?

with(StringTools):
Alphabet:="THEQUICKBROWNFXJMPSVLAZYDG";
        ...

Hi,

I am using the function simplify in order to simplify some big expressions I have. The poblem is:

I have the expression F=F(x1,x2,x3,......,xn)  and if I evaluate the two following expressions

expr1 = subs(x1=a, x2=b, x3 =c , .......,xn=d, F) = F1    (scalar)

expr2 = subs(x1=a, x2=b, x3 =c , .......,xn=d, simplify(F) ) = F2    (scalar)

Normally F1 and F2 are equal  ( F1=F2 ) but what I really get...

I've downloaded and installed Maple, but I can't activate it. Whevener I try and activate it from within the program, it freezes, and when I click Activate Maple on the Start screen nothing happens. I tried the offline activation service, copied the licence.dat file into the Maple license folder, but when I tried to open Maple it still said license file missing or invalid.

I'm using a license provided by my university, and I'm running Windows 8.

Hi when i'm trying to solve, i get the following warning: Warning, solutions may have been lost.

The equations i'm trying to solve are the following:

> P := 21000;

> v := 10/(60*1000);

> r := 983;

> Cp := 4181;

> Tl := 40;

> K1 := 124.27;

> K2 := 102.03;

> K3 := 7.23;

> K4 := 2.947;

> eqn1 := P = v*Cp*r*(Tf-Tr);

unable to handle elliptic PDEs
 Does this error mean that I can/t solve my PDE system by Maple?

l1 := 2*(diff(ur(e, t), t))+(1+tanh((1/20)*e))*(diff(ui(e, t), `$`(e, 2)))+2*a*(ui(e, t)*ur(e, t)*ur(e, t)+(ui(e, t)*ui(e, t))*ui(e, t))+m*ui(e, t)*(diff(ur(e, t)^2, e))+m*ui(e, t)*(diff(ui(e, t)*ui(e, t), e)) = 0

l2 := -2*(diff(ui(e, t), t))+(1+tanh((1/20)*e))*(diff(ur(e, t), `$`(e, 2)))+2*a*(ur(e, t)^3+ur(e, t)*ui(e, t)^2)+m*ur(e, t)*(diff(ur(e, t)^2, e))+m*ur(e, t)*(diff(ui(e, t)^2, e)) = 0...