L include kinetic energy

when F = diff( diff( L, dx), t) - diff(L,x)

i need to diff L with respect to dx, however, there is no dx in maple, how to do above equations?

with(DifferentialGeometry):
DGsetup([x],M):
ExteriorDerivative(x^2);

invalid frame: DGframe_data[0][1][2]

how to diff x^2 to get 2*x*dx with above command?

How come that I don't have a Maple Questioner Badge? 2886 people question Maple and I trust it unquestionably?

Even adiban who didn't post anything on this site, has it (as well as 10 other badges and a reputation of 1000).

I have a Pupil badge, which I couldn't get without asking a question - so I've asked at least 1 question.

Let's see if I get it after asking this question.

Alec

1.at parse(sprintf("%.3f",subs(x=1, pdf))); it error said number expected for floating point format

i need to copy the whole formula to pdf := something then it can calculate

2. also it can not plot

%%%% copyright by Martin Lee 2011%%%%%%%

l := [12, 14, 27, 35, 46, 49];
sl := gfun[listtoseries](l, x, egf);
g := convert(sl, ratpoly);
g := g - subs(x=0, g);
g := g/subs(x=1, g);
parse(sprintf("%.3f",subs(x=1, g)));
parse(sprintf("%.3f",subs(x=0.9, g)));

How to reserve dx when diff a formula

when i diff x^2 , need to be 2*x*dx but it only 2*x

How to reserve dx?

How do I create a symbolic sequence with a variable number of elements, so that later I can come back and set the number of elements to an integer? Maple has inert forms for many functions (e.g. Sum and sum), but there does not appear to be anything like "Seq" which would be the inert analogue of "seq".

Here are some of my attempts

  Ls:='seq'(a[j],j=2..p);
eval(Ls,p=5);
subs(p=5,Ls);
Ls:=seq(a[j],j=2..5);
Ls:='seq'(a[j],j=2..5);

Hi,

I have this problem when I use assume and assign a value to an assumed parameter.

Example:

restart:assume(beta>0):

g:=int(Sum(5*sin(n*beta*x),n=1..5),x) ;

beta:=1;

g;

Normaly beta:=1 is replaced into g. The result obtained is function of beta and beta:=1 is not replaced.

Why beta:=1 is not replaced in g ?

Thanks for suggestion

everywhere i tried to find out how to solve system of linear equations like A*X=F, whre A is a matrix and X and F are vectors, the solution is X:=linsolve(A, F),

but in maple 14 linsolve doesn't work, so are there any analogues for this linsolve function in maple 14 or maybe another simple way to solve this system?

thanks

Hello friends, help, I created a symmetric matrix whose graph is 17 * 17, but in trying to apply

I have the following variable

s1:=(1/2/Pi+Q*cos(k*phi))^3*cos(k*phi)/(1+beta^2*(1/2/Pi+Q*cos(k*phi))^2)^2;

and then I make a substitution as follows

s2:= subs(cos(k*phi)=((1-u^2) / (1+u^2)),sin(k*phi)=((2*u) / (1+u^2)), s1)*1/(1 + u^2);  -----(1)

Now if I set up a function f that maps u to the right hand side of (1) above as follows

f:=u->(1/2/Pi+Q*(1-u^2)/(1+u^2...

I'm trying to compute the determinant of a 19x19 matrix, each with entries consisting of multivariate polynomials (polys in 6 vars, of degree at most 8).  Specifically I want to factor the determinant.  Running this on Maple 15 quickly gives an "object too large" error in the determinant function, after using only 700 MB of RAM in about 2 minutes.  My machine has 3GB of RAM, so I am confused as to why this object is "too large". 

I...

I  used the DEtools package recently.

When working in a differential algebra with _Envdiffopdomain=[Dt,t] maple still returns something like Dt t^2. I would like him instead to assume, that Dt= dt/t and rewrite it as 2t + t^2 Dt. How can I achieve this behavior?

I want to change the direction of the tickmark labels.  As far as I know, only the axes title labels can be oriented with labeldirections=[horizontal,vertical]. 

Can the tickmark labels along the x axis be vertically oriented?

It looks like maple uses the "builtin" `*` for multiplying polynomials.

I am trying to write a new function `&*` that will multiply polynomials with non-commutative coeficients. I was wondering how I could start by looking at how the "builtin" `*` works.