I cant understend how to use new Maple workbook, and i cant load it on a site so i will use screenshoots to explain. I whant to add my costume functions to code attachments and exceuted them in multitipe workshellds, but i dont know how to excecude them from ther + i cant understend how varibles sistem work. For excemple i go main document ex1, in it i save z as global varible for all worksheed, when i excecute it works alright in other workdoxument c2 but when i change it in main document it didnt change in others, but in saved varibles in ex1 saved new value of z , and in all others z is left same as it was. In such whay i can save function f2 wich is declorated in workdocument c2 as varible, it will exceute in main ex1 but any changes of f2 in c2 wudent be applied in ex2, if i declorated and excecude f1 in c1 code attachment it dont even generate in varibles tables + i dont see any whay to excecute it from ex1, so here the qestion how to excecute functions saved in code attachments in other book's wordsheets and how make saved varibles usable in all book?

Hello! I am facing the problem to making the grahp of system of ODEs in the attached file from eta=-1..1. Please see the attachment and fixed it. I will be waiting your positive response.

new_graph_exact.mw

With my best regards and sincerely.

Muhammad Usman

School of Mathematical Sciences 
Peking University, Beijing, China

Email: muhammadusman@pku.edu.cn

Mob #: 0086-13001903838

i got 3 diff ecuations with two algebraic ones. a system of DAEs. there is only a derivative included on systems, for which it's necesary only one initial condition for solving the system, which is Q(0)=0. why maple wants to know initial conditions for T_1s. it's not supposed to calculate it itself?
 

Download ecuation_2.mwecuation_2.mw

Dear Friends, I work with physics paсkage. One allows to calculate in four dimensional space-time. But in addition, I need to calculate in three dimensional space. For example, I need t0 use the next scalar products: x_Ay^A  and z_aw^a  where A=0,1,2,3 and a=1,2,3. How may I do it?

I dont understand how to approach this question, can anyone explain what it means by bessel and myJ?? Ive tried but i cant get the integral to work with the dy?

Dear all

I am trying to solve system of ODEs by TWS command for traveling wave solution, but an error is showing. When I enter sinlge ODE or PDE the command does not show any error. Why it is showing error for system of ODEs ?

Download ODEs.mw

Hi everyone

I would like to unassign all  'user' variables but some of them.
More precisely, if 

• MyVars := anames('user')
• and KeepThese := {...} is some subset (manually constructed) of MyVars

I was thinking to something like
for k in MyVars minus KeepThese  do
   k := 'k'   # or k := unassign('k')
end do;

... which (obviously) does not work as desired because 'k' refers to the variable of name k and not to the variable k represents.

How is it possible to fix this ?

Great thanks in advance

Hello,

I try to retrieve some procedures from a package that I have in a 2D output.

But, when I copy/paste in a 1D maple input or a simple text file, the main part of the procedure is replaced by "...".

Example :

Package:-procedure
proc(a, b)  ...  end;

Do you have a idea to suppress this feature ? and so that I can retrieve the desired procedures?

Thanks a lot for your help

how to find roots of equation J0(xR) = 0 ,R is constant, using maple? I know command for zeros of Bessel function i.e J0(x) = 0.  but what to do with different argument?

How do I make find and replace work?  Currently the replace and find button is grayed out.  What magic gets me into a state where the button can be used?

Thanks

P.S. Is there any "package" or "mode" or way some how that emacs key bindings can be made to work (including things like find and replace)?  The user interface would be much improved if I knew how to enable that.

Hi everyone,

I need some help with the following error,

How can i solve this problem?

Thanks for your time

Best regards,

Canberk

Hello,

I would to understand a code that I have where the structure of packages are often using a local variable in a particular way. A variable local _DO_CONSTRAINT with the same name as the procedure DO_CONSTRAINT is created.

The code is the following :

module () 
local _DO_CONSTRAINT; 
export DO_CONSTRAINT; 
option package; 

_DO_CONSTRAINT:=proc (phi::list, varslist::list) 
table([obj = CONSTRAINT, expr = phi, vars = varslist]) 
end proc

DO_CONSTRAINT:=proc (phi::{list, scalar}, vars::{list, scalar}) 
if type(phi, scalar) and type(vars, scalar) then 
_DO_CONSTRAINT([phi], [vars]) 
elif type(phi, list) and type(vars, list) and nops(phi) = nops(vars) then 
_DO_CONSTRAINT(phi, vars) 
else ERROR("The number of expressions <phi> and variables <vars> are not equal") 
end if 
end proc

end module
 

Question :
1) It seems me that this technique enable to adapt the procedure  (DO_CONSTRAINT) to different types of inputs that we can try on it (lists or scalars). Do I right ? May you give me more informations on how it works ?
2) Is it the only possibility to do this ? In other words, is there a possibility to make a similar code and also concise but without using this local variable ?

Thanks a lot for your help.

I having a hard time with defining a vector, in order to store in it some data, then plot it and export it to a file, I copied all what's in the help instructures but it doesn't work everytime, please it's urgent for my PhD thesis !

E_T := (2/mu-2/r)*exp(-r/mu)*Pi^2;

How do I extract the numbers out of the equation, so it becomes

2*Pi^2*(1/mu-1/r)*exp(-r/mu) instead? 

Hi, I was wondering, as stated in the title, if it is possible to plot/draw a triangle knowing only the sides and angles, and not the coordinates for each point making up its corners. If not, what would be the easiest way, to calculate the coordinates using the sides and angles (assuming I know the value for each side and corner) and then plot/draw it?

I'm rather green when it comes to using Maple, so if you could explain it in a simple way that would be appreciated.