I was using maple the other day, and suddenly i found out my 3D graph turned into black, but when i save the file as pdf, it could show the graph. And also it doesnt affect the maple displays 2D graph. So i wonder how did this happened and how i fix it.

Hi,

I'm having trouble getting to grips with this problem.  I have a set of 21 objects A:={a,b,c,d,e etc} and I want to create another set B of length 10 consisting of some of the elements of A. I then want to carry out a test on B.  However, I then want to repeat the proccess for another set B and another and another until all possible set Bs have been tested. For example

A:={a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u} #This set is constant and should never change

Dear All,

Kindly help me plotting the following equation:

beta = 0.25

alpha0 = 0.2580   or 15 degrees

alphad = 0.545    or  31 degrees

Bmax = 0.7

alpha = 0 to Pi/2

B(alpha) = (1-beta-beta*cos((Pi*alpha)/(0.8*alpha0)))*Bmax      for interval     0<alpha<0.8*alpha0

B(alpha) = Bmax       ...

Hi, i am trying to create a breakpoint on my worksheet. But i cannot press the debug current operation icon. Is there some other settings that i must press before using the button? Please help. Thanks.

Hi, may I know how do i rearrange the matrix by shifting them please?

For example, i have a 9x9 matrix. I would like to shift the first column to the end (1..9,1) becomes (1..9,-1), and the rest of the matrix (1..9,2..9) becomes (1..9,1..8).

Please help. Thanks.

Hi; I am working on a package where the data mostly come in Maple records with a varisble number of fields with different names. At least one field in each record has a 6 by 6 matrix, the expressions of which involve the values associated with at least some of the other fields.

Occasionally I have the need to, say, apply a function to each of these fields. E.g., I want to substitute a value for a specific name; this name may show up in several fields and also will show up in the matrix.

ode1 := Diff(y(x),x$2) + (lambda-x^2)*y(x) = 0;

After put y = exp(-x^2/2)*y1(x) into above ode1

would like to find the solution of ode in terms of integration

in this example, it use z^(-lambda/2-1/2) = expa(-lambda/2-1/2)*log(z)

the example solution should be int(exp(...),z)

linearsol(ode1, y(x)); but return {}  nothing

Thanks a lot

Hi all. I am trying to use the Weyl character formula to evaluate some traces of Hecke operators on algebraic modular forms. This involves me having to substitute certain eigenvalues of 4x4 matrices into a polynomial of arbitrary degree (my choice).

I have created procedures that do this given the eigenvalues. Unfortunately I am having problems generating the eigenvalues.

The problem is that the matrices I am using are formed from products of matrices from two...

Hi,

Assume having to solve an ode with dsolve and plotting with odeplot. Further, markings at specific parameter values of the solution should be plotted, i.e. if p is the solution of the ode, the points p(t1), p(t2), ... should be plotted. Since the ode is complicated and computation takes a lot of time, is there a way to extract the values p(t1), ... from the odeplot result directly without invoking calls like subs(p(0.5),b(s)) again?

Fine $a_{n}$ of sequence  2 , 3 , 6 , 7 , 10 , 11 , 14 , 15,...

Why do the statements eval(sign(x),x=-2) and subs(x=-2,sign(x)) both give plus one while sign(-2) gives -1 as expected?

Hello every one,

I got an error while trying to solve numerically a nonlinear system of odes using 

the dsolve command. This error is very common,

"Error, (in dsolve/numeric/bvp) initial Newton iteration is not converging".

I tried the different technique explained in 

http://www.maplesoft.com/support/help/Maple/view...

I want to graph the portion of the plane 2x + 3y + z = 6 that are located in the first octant of a xyz coordinate system. The following implicitplot3d should in principle do it: