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> restart;
> with(DifferentialGeometry):with(LinearAlgebra):with(JetCalculus):with(Tools):with(PDEtools): with(DEtools):
> declare(u(x(t),y(t),t),v(x(t),y(t),t));

u(x(t), y(t), t) will now be displayed as u

x(t) will now be displayed as x

y(t) will now be displayed as y

v(x(t), y(t), t) will now be displayed as v

> PDE_sys:={diff(u(x,y,t...

Was given the equations f(x)=x^3+3x+7 g(x)=tan(x^2+1)
Need to use maple to differentiate each of the following...
A. f(x) * g(x)
B. f(x)/g(x)
C. f( g(x) ) entered as f@g
D. g( f(x) )

How do i differentiate these, normally for its just D(f) but i tried D(f@g), D(f * g) but it doesnt look right. Please help!

Has anyone had any experience of using an eBook reader such as a Kindle to read/display any of the Maple manuals?

Hi everyone,

I'm having trouble solving a set of pdes and keep encountering the following error:

Error, (in pdsolve/indexlex) invalid input: a string/name list is expected for sort method `string`


I have been trying to find out why I get the error or what the indexlex error is but am stumped... I cannot find anything on the Maplesoft or mapleprimes websites about it.


This is the code I am using which is giving the error:

How do I download and save "MaplePrimes" ?

Thanks for your help!

I am using finite element analysis and have 47008 nodes, so require a 47008 by 47008 matrix.  I wish to create the matrix using a procedure and using if statements to fill in the matrix with the equations (mostly repeating and every element in each row is 0 excpet for 4 or 5).  Anyway, I have tested my solution method on a much smalller matrix and know it works.  My question is if there is a way to create such a large matrix without getting a memory error, and...

I am sure there will be a simple solution to this problem. Basically I am doing some work on Fibonacci numbers and the convergence of fibonacci(n+1)/fibonacci(n). My code basically is looking for the first n that comes within a certain distance of this convergence.

I am looking for the code to print just the first result from my code rather than all n for which it is true which it is doing at the moment.


Is there a specific maple command for this or does anyone have any ideas?

During a spam attack, like mapleprimes is seeing now, all of the posts are all out of whack.

Once these spam posts are deleted the posts and questions keep the same wrong order.  I am suggesting that once a post or question has been cleaned of these spam posts that the question/post revert to it's previous proper position in the order of the date on the last posted action. 

Perhaps this is already being looked at? 

One more suggestion. ...

Hi everyone,

I am having trouble determining how to obtain the area under the curve of a "complex" dsolve graph, as an example:

> restart;
> with(plots);
> g := diff(S(t), t) = t^2;
> q := diff(R(t), t) = t;
> ode1 := dsolve([g, S(0) = 1, q, R(0) = 1], [S(t), R(t)], numeric, events = [[t = 600, S(t) = 10^7], [t = 800, S(t) = 5*10^7]]);
> odeplot(ode1, [t, S(t)+R(t), color = blue, thickness = 2], 0 .. 1000, numpoints = 1000);...


I am attempting to do a least squares regression with two variable (HK and S) generating my curve.  The equations are extremely tempermental and won't allow maple to solve them using normal methods, so I'm resorting to numerical methods to minimize the least squares.

I am attempting to create a dataset that I can search for the minimum of "k" and have it tell me what "i" and "j" values I used to get there.  The code below is the basic idea, the...

Dear all,

I come up with a problem. When I execute the following commands in 2d mode, error occurs:

restart; with(MTM); with(plots); r := .125; omega := .3; l := 1; m := 4.5; IG := (1/2)*m*r^2; A := Matrix(4, 4, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 1, (1, 4) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 1, (3, 1) = 0, (3, 2) = r*omega^2*(IG+m*r*(r+l))/(l*IG), (3, 3) = -2*ldt/l, (3, 4) = 0, (4, 1) = 0, (4, 2) = -r*omega^2*(IG+m*(r+l)^2)/(l*IG), (4, 3) = 2*ldt/l, (4, 4...

I have a file  g:/
From a seperate maple worksheet I want to modify the Document Property `Author` to  "aname" in the file g:/

One could simply ...
open the worksheet g:/  and
SetDocumentProperty(`Author` , "aname"):

That's okay, but how to change it remotely?  I don't know if it's even possible.  I was trying ...



implicitplot(x^2 + y^2 = 1, x=-2..2,y=-2..2)

This command produces a plot with the range x = -1..1, y = -1..1 instead of what I specified.


I don't remember this being a problem on the older editions of Maple. 

I need to use Krylov functions widely in my project. They are recurrent functions as follows:

Can I make Maple operate with these functions?


Curiously I find myself guilty of never filling out the document properties fields. Author, Keywords, Subject and Title. I have also noticed that no one else, or at least a majority of maple users don't bother with this although I haven't found anyone who actually does fill these fields out, just browse the applications in the application center. What other usefullness do these attribute field placeholders have? Seeing that no one makes use of them, it doesn't seem that...
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