Hi, I was wondering if there is a way to use Document Components or Maplet Elements from Java? Is there a file that has the library for these components? I use the Netbeans environment, has anyone set up that environment to use Maple libraries? Thanks, Art

I have the initial and boundary conditions: cond := ro(x, 0) = 0, v(x, 0) = 0, {ro(0, t) = 10, ro(40, t) = 20}, {v(0, t) = 10, v(40, t) = 20}; The PDE system is: sys2 := {diff(ro(x, t), t)+diff(ro(x, t)*v(x, t), x) = 0, diff(v(x, t), t)+v(x, t)*(diff(v(x, t), x))+3*ro(x, t)*(diff(ro(x, t), x)) = 0}; I use: sol1 := pdsolve(sys2, {cond}, numeric, time = t, range = 0 .. 40); values := sol1:-value(); ... When I try to see the values I receive the following error: values(40, 20); Error, (in solnproc) unable to compute solution for t>0.: column vector dimension less than length of sparse data

I am trying to calculate the second derivative of a taylor expansion. Could anyone tell me how to enter this command? Thanks Rachel

Can someone point me in the direction to integrate a maple file into a java program? I made a maple file that has a variable and will output a final graph after long calculations.. What I want is a nice java app where the user can simply type in the variable they want, and a graph is displayed in a window? Just a general kick in the butt to the direction for documentation about such a process would be great! Thanks!

Inspired by the post Re: the physics package I decided to have a closer look at the function FeynmanDiagrams. As the Lagrangian I thought I might as well take the QED Lagrangian for a massless spinor field Q[i](X) coupled to an external electromagnetic field A[mu](X):

restart:
with(Physics):
Setup(advanced):
L_QED :=
   +Dagger(Q[i](X)) * Dgamma[4] * Dgamma[mu][i,j] * I * diff(Q[j](X),X[mu])
   +Dagger(Q[i](X)) * Dgamma[4] * Dgamma[mu][i,j] * e * A[mu](X) * (Q[j](X));

Hello, I'am using Maple 11 and have the following problem concerning plots of ODE: ode := M*(diff(x(t), t, t))+K*x(t) = Force; sol := dsolve({ode, x(0) = 0, (D(x))(0) = 0}, numeric); xx := (t) -> rhs(sol(t)[2]); dx := (t) -> rhs(sol(t)[3]); M := 1; K := 4*Pi^2; test := proc (F, t) global Force; Force := F; xx(t) end proc; When I call test(F,t) directly everything works fine: test(2, 2); -2.49946953367608378 10 ..... However, when I try to plot the test-function vs Force I get an error message: plot(test(pressure, 1), pressure = 1 .. 3); Error, (in sol) global 'Force' must be assigned to a numeric value before obtaining a solution

I've been trying to plot the function f:=x->(e^(-a*x^2)-b*x*ln(1+x^2))/(2+x^2+c*sin(Pi*x)); with values a,b,c which have been assigned on maple. when i try to plot the function using: plot(f(x),x=-4..4); I get the error: Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct Error, empty plot I have tried all ways i can possibly think and cannot get it to plot the graph. Can anyone help?

Although this question might seem silly to Maple experts, I cannot help asking, since despite a long search through Maple Help and Maple Guides I was not able to come across the answer. What I mean is this: > eq1 := diff(y(t),t)-y(t)^2+y(t)*sin(t)-cos(t) = 0; > # here I want some command that would return the order of eq1, i.e. 1 > something(eq1); > eq2 := diff(y(t),`$`(t,2)) = y(t)*u(t) + diff(u(t),t); > something(eq2,y); # this should return 2 > something(eq2,u); # this should return 1 Besides, I would also need the same for recurrent (shift) equations, i.e.

So what is the best way to put a "link" from one place in a maple document to another. So that someone can jump quickly when clicked? Thanks!

I got an interesting error message

assume(x>0);
assume(lambda>=0);

f:=(x,lambda)->2/(1+lambda)*1/( 1/(x+lambda)+1/(1+lambda));

                                 2                   
(x, lambda) -> --------------------------------------
                            /    1            1     \
               (1 + lambda) |---------- + ----------|
                            \x + lambda   1 + lambda/

ftilde:=(x,lambda)->1/2*(x+1-(x-1)^2*f(0,lambda)/f(x,lambda));

                                2             
               1     1   (x - 1)  f(0, lambda)
(x, lambda) -> - x + - - ---------------------

Hi, I'm trying to solve a set of simultaneous equations, and the solutions I get are expressions of _Z. I'd be most grateful if anyone could explain what this means.

Hi, I stored the closed-form symbolic result of a long computation in a library. When I try to substitute numerical values into the functions I saved, subs (applyrule, etc.) do not make the substitution. Looking at the operand that I think should substitute ('Ip' as stored), it is not evalb equal to 'Ip' (as typed into evalb). It appears that Maple thinks I have two different symbols with the same name. Can anyone explain this behavior to me? Thanks, Art

when you take the limit as x approaches infinity of the following problem Maple 11 give an answer of 1. I think this is not correct. doing the limit manually I get e^ab. Lim (1+[a/x])^(bx) x->infinity I enter the limit using the expression palette. Any input would be welcomed. Thank you.

Hi, How I can know the goodness of my fitting?and what is equation which Maple usually use to calculate the standared deviation of the fitting parameters and the residual mean square, the residual standard deviation and the residual sum of squre.please see the file.Thanks Please replace this text with the link to your file. The link can be found in the File Manager and tha data file is: Please replace this text with the link to your file. The link can be found in the

Hey guys, here is the absolute last question concerning my project. I'm so close to the end line I can taste it, yet this final problem is preventing me from opening that bottle of champagne. The Objective: Getting Maple to animate a block to slide up a 30 degree slope given a users initial velocity and mass. The Method: A sequence of frames using rectangles with Plot package. An array to store all the vector information for vector arrows. The Problem: The box goes up, however does not come down. The Root Reason: I don't know how to tell the sequence to go down, only forward.