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!

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.

Marben packaging makes open boxes(no Top) out of cardboard squares whose sides are 6 ft. long. What is the maximum volume they can obtain from the cardboard

Defferentiables Two highways intersect at right angles. Car A on one highway is 0.5 kilometer from the intersection and is moving toward it at 96 kilometers per hour, while car B on the other highway is 1 kilometer from the intersection and is moving away from it at 88 kilometers per hour. At what rate is the distance between the two cars changing at the instant.

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.

I am generatings sets and lists of points [x,y,z] where x,y,z are floating point (real) numbers. And sets and lists of such set, etc. The computations which produce the lists and sets need to be done with Digits set to some large value but I want to consider two such sets or lists or sets of such sets, etc, to be equal if the components x,y,z, of the points in the sets etc, are equal to say 8 decimal places. Can anyone suggest a good, hopefully simple, way to do this? Applying evalf[8] to all expressions doesn't work. I have a very messy way to do it, but there ought to be a better way.