EI {dy(x,t)/dx } +CA{d y(x,t)/dx}= summation of (F_o (sin(5nvt/r)sin(nwt)))  from n=1 to n= infinity

the derivative here are partial not ordinary

where EI, CA ,F_o , v ,r and w are constants 

Hi guys,

What is the exterior product of

 

       1  0  3  0

 A=(                 )

      -2  3  1  4

 

       1  4  -2  2

 B=(                 )

      3  2  0  4

written as A^B?

Hi there,

does anyone know how to write standard multicolumn numerical data sets generated by a "for" loop into an array of data files with names "dataset%.txt", where % is iteratively given by the value of the loop index? Thanks a lot. 

hi,

how do i solve the following?

 

restart:

ode:=diff(y(t),t$2)+y(t)=piecewise(t in [0,Pi],t, t>Pi,Pi);

ics := y(0)=0, D(y)(0)=0;

 

dsolve({ode,ics});

Thanks

 

Hi everybody,

I'm not really sure of where sould I post my question.

Let me explain my problem :

I've got a convolution product of my function f and my filter called G (let say a gaussian for example, or a top hat filter). It is as follows :

filtre:=proc(g);
return x->(1/(2*Delta)*int(g(t),t=(x-Delta)..(x+Delta)));
end;

filtre:=proc(g) local a,G;
G:=x->sqrt(gamma/(Pi*Delta^2))*exp(-gamma*x^2/(Delta^2));
return x->int(g(t)*G(x-t),t=-infinity..infinity);
end;

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?