Dear ...

Let us consider $F$ be a parametric polynomial set. How can decide that $F$ contains a constant or parameters, automatically? For example, if $F=/{a*x^3-1, b*y+x, -1, c/}$ where $a, b$ and $c$ are parameters and $x$ and $y$ are variables then the output of procedure is true since of $F$ contains $c$ and also $-1$ and the outputs for $G=\{\a*x^3-1, b*y+x, x+y}$ is false. Is there any command or simple procedure for this conclusion?

I am looking forward to hearing from you

Sincerely yours.

The command eval allows to simplify a complicated expression

in a more compact form for a later output in LATEX

In the example which follows I was able to insert A and B but non C in the expression.

There is already a post on this kind of topic but I failed to understand the details.

Perhaps a Maple worksheet of answer on this topic  would be useful !

bye Lorenzo
 

Download maple_primes_eval.mw

maple does not work at all

it displays this error

Error, (in StringTools:-FormatMessage) unknown option MAPLE
 

Hare in the forest

The rocket flies

Быльнов_raketa_letit.mws

Animated 3-D cascade of dolls

3d_matryoshkas_en.mws

"From the list of positive integers 1; 2; 3; 4; : : :, remove every second number, leaving
1; 3; 5; 7; 9; : : : Since 3 is the flrst surviving number above 2 that has not been used
as the \killer", we remove every 3rd number from the remaining numbers, yielding
1; 3; 7; 9; 13; 15; 19; 21; : : :"

 I have tried using this:

A:= proc(n::integer)::list;
   local B,C,j;
   B:={seq(i,i=1..n)};
   for j from 2 by 2 to n do
       C:= {B minus {B[j]}};
   end do;
 end proc;

But I'm not getting the desired result.

Hi, I am trying to get back into the habit of making maplets for the sake of uncomplicating things, I never had trouble with loading this package before, but strangely now when i enter:

with(Maplets[Elements]);
maplet1 := Maplet(["Hello World!", Button("OK", Shutdown())]);
 

I get the error message:

Error, `Elements` does not evaluate to a module

Hi

I've just installed Maple latest + MapleSim with the license provided by my university (I use VPN with a secure key to remotely access server license. Everything works fine, except for the context menu. It seems that the context menu module is missing! I tried uninstalling and reinstalling, but did not help.

I went back to the campus and checked Maple installation on computers there, and this problem is absent (context menu is working fine).

I can only use the context menu toolbar on the right... but this is not very convenient. 

What could be the problem? See the attached image.

Thanks

---------------------

Download ITRATIVE.mw

 PLS

HOW CAN I ITERATE THIS PDE IN THE FORM OF PICARD ITERTION.

ATTACHED IS THE MAPLECODE  STARTED WITH.

How we can integrate this matrix from -1 to 1 w.r.t   't'  ?

I have a PDE system that relates four functions: sht1, svt1, Lt1, Jirt1.

I'm trying to solve this system numerically, but the pdsolve command returns an error (this error does not make sense to me).

Where am I going wrong?

Thanks!

Test.mw

Hi!

How to calculate  a value in MAPLE:

My code:

evalf(eval(diff(n*Zeta(n, 3), n), n = 3)); give me:

#-0.3740436824 + 3.*eval(diff(Zeta(n, 3), n), {n = 3}) ,it should be only:-0.3740436824

OR:

fdiff(n*Zeta(n, 3), [n], n = 3);

#fdiff(n -> n*Zeta(n, 3), [1], [3]) ???

It's a Bug  or (As Designed / Not a Bug) ?

Thanks in advance.

Mathematica code:

D[n*Derivative[n][Zeta][3], n] /. n -> 3 // N;

(* -0.374044*)

Hi!

I am very interested in using the "phc.module", which is a module to work with "polynomial homotopy continuation" method. Please, see this paper      

I have downloaded the following files: [copied without permission, deleted by moderator]

Then, I open (as an "ordinary" maple worksheet) the file "phc_savelib.maple" and execute it, but it seems that I can not use their functions and procedures because it returns errors. 

For instance, follwing the attached PDF,  in the phc_savelib.maple file, define the polynomial system:

T := makeSystem([x, y], [], [x^2+y^2-1, x^3+y^3-1])

and try to solve the above system 

sols := solve(T)

but returns the error 

Error, (in fopen) file or directory does not exist
 

Many thanks in advance for your help!

Hi! I have some problems with solving convection-diffusion equation. The liquid phase move up with velocity W. And displace vapor phase. C - molar concentration of gas. z - coordinate. w - velocity. h - height of tank. t - time.

Its not clear to me how to set moving boundary condition on bottom boundary, so C(0,t)=cs must move up with w velocity.

May be maple have some procedures to make moving boundary or adaptive mesh??? thank you!

eq1 := diff(c(z, t), t)+diff(w*c(z, t), z) = d*(diff(c(z, t), z$2));
IBC := { c(z, 0) = 0, c(0, t) = cs, (D[1](c))(h, t) = 0}