Hi, i have a dgl i want to transform:

y''-7y'+10y = (sin(2x))/x

The laplace command works, but how can i insert initial conditions ? The help page says:

Hi,

Is there a command to extract the number of (significant) digits for each of the elements in a list?
Thanks for helping me.

Hans van Walen

 

Hello :) I would like to print my Maple Documents or Worksheets, or export them as a PDF. For sure i allready found the functions for that in the Drop Down Menue on top, but: The prints, as well as the PDFs convert the Font, and lots of things get converted somehow. For example a "Minus" Sign in an "l". I uploaded an example Screenshot here: http://gallery.mac.com/gernot.heissel#100024/BspFoto-20Maple-20Print&bgcolor=black First row is Screenshot of the expression in Maple 2nd row is what a convertion into PDF of this expression looks like.

hi,

i have to do a exercie to draw a sphere with maple. (radius = 5 )

first problem is to get the function for the sphere(implicit and explicit)

for the implicit one google helped me and gave me:
f(x, y, z)=x²+y²+z²-r²=0

i plotted it succesful with
plots:-implicitplot3d(f(x,y,z)=0, x=-5..5, y=-5..5, z=-5..5, scaling=constrained, axes=boxed);

for the explicit function i tried to solve the function for the x variable:

exp_x :=(y,z)->sqrt(r^2 - y^2 - z^2); 

Hi,

 

First, is there a simple way to write the double derivative of a function say x(t) so I will receive as output x(t) with the double quote on the top instead on writing it in a long form diff(x(t),t,t)

Secondly, I have a problem with a system of pulleys.  See if you can find where I am missing something.  Here the file:

 

For the last hour I have been starring at this problem.  Each time that I think I understand what is being asked my mind confuses itself.

Here is the problem.

http://img262.imageshack.us/img262/8387/helpxz2.png

 

Me or Maple?

Okay here's the problem.  A function is described as Y:={a*t^2*[exp^(-b*t)]*cos(c*t)}/(1+d*sqrt(t));

I differentiate Y wrt t to find the velocity of the funtion V:= diff(Y,t);  also acceleration A:=diff(Y,t,t);

I give some values to a,b,c,d and assign a T:=20  and so a:=2: b:=3/8: c:=10: d:=1

Now I plot to view the velocity of the function over the time t=0..T    plot(V,t=0..T);  GREAT!

I've written a procedure to generate a Farey sequence F_N of order N where b=1,2,...,N & a=0,1,...b; as follows:

restart:
> farey:= proc(N::posint)
> local a,b,L:
> for b to N do:
>   for a to b do:
>   if a<=b then L:=sort([op({seq(seq(a/b,a=0..b),b=1..N)})]):
>   end if:
>  end do:
> end do:
> print(F[N]=L);
> end proc:

How can I show that the parity of the spherical harmonics Y[M,L](theta,phi)  is  (-1)^L?

hello..

everybody who read this message, please help me..

i really need your help..

i am given an assignment about heat equation and i need to solve it by using Maple.

i know nothing about Maple even never use it before.

this is the question:

Consider the heat equation u_t(x,t)=0.2u_xx(x,t) with the following boundary and initial condition:

u(0,t)=u(1,t)=0, t beetween 0 and 0.1

u(x,0)=100sin(pi*x), 0<x<1 take h=0.1 and k=0.01

Hello,
I want to remove properties (assume) programmaticaly.
in all the following code, e is indets(f); where f can be any function, list etc.

none of the followings works :
unassign(e[])
map(x->unassign(x),e);
assign(map(x->x=uneval(x),e));
etc.

the following seems to work, at first
assign(map(x->x=uneval(uneval(x)),e));

but finally no:
assume(a,'constant');
e := indets(a*x+b);
assign(map(x->x=uneval(uneval(x)),e));

This is a word file conatian a full discription for a partial differential equations please help me to solve it  

 www.4shared.com/file/44705973/d2bd94e4/New_Microsoft_Word_Document__3_1.htmlplease

 

please help me

Prove that vectors , and are coplanar if and only if vectors ,

hi,

i've a problem with a least square exercise.

3 measured values are given:

xi = 1, 4, 6

yi = 2,4,8

i've to find a optimized function of the type "y = f(x) = k * 2^(bx)"

till now i just worked with linear least square exercises like y = px + q. how do i get started with this one. what do i have to do?

thx for help in advance