I found system remember tables mentioned under Details in ?CacheOption.

What exactly are they? Anything special about them?

The ProgrammingGuide does not given more details. It only mentions that there are "procedures that cannot use option system remember tables". For what reason a procedure cannot use them?

For the following limit determination, I do not get the known result 2, but only a term with LerchPhi. Please give me some advice.
lim(n-->oo)[(n/(2^n))*sum(k=1 to n) (2^k/k)]

I wish to plot two line segments over the intervals [0,1] and [2,3].  Maple 2024 draws a single line segment over [0,3].  Oddly enough, if I specify a color option, then it produces the expected result!

This used to work correctly in Maple 2023.  Perhaps this can be corrected in the forthcoming release?

>  restart; >  kernelopts(version); >  plots:-display(         plot(1, x=0..1),          plot(1, x=2..3), thickness=5); >  plots:-display(         plot(1, x=0..1),          plot(1, x=2..3),thickness=5, color=red);

Download mw.mw

Does this happen to you (ChatGPT session):

I am taking a course in quantum mechanics and trying to do the calculations in Maple.

In the worksheet below I try to solve a system of equations to find some constants. 

It isn't very relevant that the domain is physics. 

The issues I have are with manipulations of expressions (specifically, simplifications).

Download solve_constants.mw

In reality, I would like to the entirety of sqrt(2m(E-V__0)/hbar) a variable by the name of s.

Download simplify_roots.mw

Below is a simple demonstration of something that I am very confused about in another worksheet I am working on.

Basically, I have a function of x called psi_I and I want to define another function of x called psi_I,d which is just the derivative of psi_I.

In, the snippet below, this works if I use the variable names psi_1 and psi_1,d, but not if I replace the "1" with a "I" as I want to do.

In addition, I don't know why the output (6) is different from (7) or (8). All three are from the same command in Maple.

Download psi_subscript.mw

i want to to get the eq(14) but i need to do some Hard replacing which i am unfamiliar with it any one can help ?

Download get_result.mw

I would like to generate a brief description of the object Iterator:-Product but I get the following error:  

Describe(Iterator:-Product);

object Product :: Class<<36893490916968945900>>:

    ModuleApply( )

    ModuleCopy( self::_Product, proto::_Product, 
Error, (in Describe) `proto` does not evaluate to a module

How do I get rid of this message? 

i used: 
Y := ssystem("dir C:"); print(Y)
result is

[0,"\" El volumen de la unidad C es OS\n El n£mero de serie del volumen es: 54A9-09DA\n\n Directorio de C:\\Program Files\\Maple 2016"

Windows operating system English version but Maple shows Spanish result
I want result is English. Please help me

Download language_maple.mw

Hello,

non-expert Maple user here.  Any help would be appreciated, I am trying to perform the following process:

1) Represent State Space matrices calculated by hand (ex: A, B, C, D) as a Maple object.

2) Find a solution to the State Space system of equations based on given initial conditions, or represent the same in any other form such as a plot or table.  I am right now trying without much success to use the ResponsePlot and Simulate functions for this.

I have completed (1) using the DynamicSystems > StateSpace object of the form

sys:= StateSpace(A,B,C,D)    // where A, B, C, D are the numeric matrices of the typical S-S set.

using a simple constant '1' as an algebraic input test, I use the ResponsePlot as follows:

ResponsePlot(sys, 1) 

Maple gives me the error: 

Error, (in DynamicSystems:-Simulate) for a continuous system, the second argument (input) must be an algebraic expression or a list of algebraic expressions; received Vector(7, [0,1,2,3,4,5,6])
NULL;

I am sure I'm missing something simple.  Can someone please assist in showing me what I'm doing wrong?  I tried using a vector [0,1,2,3,4] instead of an algebraic function, but it still returned an error.  I am open to other ways too, but the next best way seems to be to convert from StateSpace into individual differential equations and then solve them all manually with dsolve.  It seems like there has got to be a simpler way than that.  Does anyone know of a simple way to implement this process?

i did try but i don't know the result is not come out? also i am not sure to put equation in eq1 in pde or linear part?

Download parameters.mw

Can I define the creation and annihilation operator commutation relations with an explicit momentum dependence?

The goal is to implement an expression of a discrete scalar plane-wave solution to the Klein-Gordon equation that makes use of the creation and annihilation operators in the Physics package.

We don't bother solving the Klein-Gordon equation explicitly. Instead, we just take a solution from literature. This approach is sufficient to show the difficulty in defining the the creation and annihilation operators in this way.

how_to_define_creation_and_annihilation_operators_with_a_momentum_dependence.mw

Download how_to_define_creation_and_annihilation_operators_with_a_momentum_dependence.mw

Whenever I have local proc inside a proc, and use local variables from the outer proc inside it, Mint tells me that the variables are not used.

This can't be right. Why does it say that? Here is MWE. I have this foo.mpl file

foo := proc()

local C1;
local y,x;

    proc()
        C1:= `tools/genglobal`(_C); 
        sol:=y(x)=  C1; 
    end proc();

end proc;

We see clearly that C1 is used, also x and y are used. There can be more code using these inside the inner proc. But this is what mint says

"C:\Program Files\Maple 2024\bin.X86_64_WINDOWS\mint.exe" foo.mpl

    |\^/|      Maple 2024 Diagnostic Program
._|\|   |/|_.  Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2024
 \  MINT   /   All rights reserved. Maple is a trademark of
 <____ ____>   Waterloo Maple Inc.
      |
Procedure foo() on lines 1 to 11
  These local variables were never used:  C1, x, y

Any idea why it says these are not used?

Also, I noticed it did not warn me that variable sol is global inside the proc. i.e. I was expecting something like this 

          These names were used as global names but were not declared: sol

Which is typical message mint gives when using a name inside a proc which was not declared,

Maple 2024.2 on Windows