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

Hi all,

I am looking for toolboxes that can handle simulation and solution of
SED with jumps, say levy processes, jump diffusion processes, etc.
Could anybody give me some pointers to really good ones in Maple and
Matlab? I did google search myself and have some findings... however I
would like to know some really good ones and popular ones so I can
discuss with fellow users more conveniently...

Thanks!

Suppose a random m*n matrix created with the palette in Maple 11. I want to replace each instance of the number 1 by the symbolic variable "a".  Does anyone have a simple way to do it?

Thanks

I have derived a transfer function for a filter and would like to sweep the frequency and evaluate the result at each point.  Then I would like to plot all of this data to obtain the filter's frequency response. Anyone know how to do this?  Do I use a subs command??? Any suggestions would be great!!

Kirk

Hello,

I have small script that uses syntax checker mint and latex command and latex to convert an expression in maple syntax to an image. But functional operators are causing me troubles.

Suppose I want to enter the equation  (x+1)*(x-1) and I forgot to use the star (*) for multiplication. The result (x+1)(x-1) is also correct because Maple thinks that I am using functional operator x. But I would like to evaluate this cas as wrong syntax. So I have to detect functional operators (somehow) but I don't want to detect operators such as +, -, * and so on.

Hi

I have this problem regarding how many employees (the variable x) is needed to get the lowest wage cost in a company. I have written the following model:

>restart:

>assume(x,integer)

>assume(x>=0)

>a:=16362-(40+x)*504:

>b:=IF(a<0,16362-(40+x)*420,(40+x)*84:

>c:=IF(b<0,16362,(40+x)*420)

>d:=IF(a>0,a*12.65*2.0)+IF(b>0,b*12.65*1.5)+c*12.65