## FHow can I set the attribute "Parameters" in a use...

Here is a notional example of a user defined  Probability Distribution:

• One of the "attribute" or "property" (sorry but I don't know the correct word to use) in any known distribution (that is already implemented in Maple) is Parameters: an example is  provided for a Gaussian RV.

• In a first stage I define a simple Distribution named MyDist and declare X as a random variable of distribution MyDist.

• Then I decide to complete the definition of MyDist by adding the "property" Parameters.
I get an error I don't know how to get rid of.

Does anyone has any idea to fix that ?

PS: I browse the Statistics library to try and understand how this "property" is defined for a known distribution but I couldn't find any clue.

 > restart
 > with(Statistics):
 > G := RandomVariable(Normal(a, b)): attributes(G)[3]: exports(%); (attributes(G)[3]):-Parameters;
 (1)
 > MyDist := (mu, Sigma) -> Distribution(Mean=mu, Variance=Sigma): X := RandomVariable(MyDist(m, V)); (Mean, Variance)(X);
 (2)
 > MyDist := (mu, Sigma) -> Distribution(Mean=mu, Variance=Sigma, Parameters=[mu, Sigma]): Y := RandomVariable(MyDist(m, V));
 (3)
 >

## How do I solve this ODE?...

I need help to solve this ODE,

I didn't get series values F(k+3),Theta(k+2),phi(k+2),error comes in summation values.and

How to find the unknown parameters A,B,C.

## I need help to solve ODE using forward-backward sw...

Maple code for solving system of ODE using forward-backward sweep method.

## Maple 2023 workbook error...

While working a test workbook in Maple 2023 - added a file went away for a while and came back and started adding code to the workbook when I suppose it did an autosave and this error came up 4x in a row.

## Difficulty with pdsolve and electromagnetics...

perturb_mag_current_density_2.mw

I am trying to calculate the electric field E induced in a vibrating cantilever of conductive material, oscillating in the field of a permanent magnet.  However, I am having some difficulty getting pdsolve to work the way I want it to.  I'm also not sure if the partial differential eqations I derived from Maxwell's equations are correct, or if the boundary conditions for the electric field in the cantilever are correct.  Currently pdsolve gives me no solutions, which makes me think that either my PDEs or my BCs are not correct.  It may be that I need to try some sort of numerical method as well.  I am assuming that the z component of the electric field is just 0.  My third PDE comes from setting the divergence of the electric field to 0.  My first two PDEs come from the vector laplacian and its relation to the divergence and curl:

Laplacian * E = Div(E) -Curl(Curl(E))

The x and y components of this should be my first and second PDE, respectively.  Note that in this equation the divergence of E is 0, and the curl of E is -dB/dt, where B is the magnetic field.

My boundary conditions are simply that the components of the electric field at the surface of the cantilever is always tangent to the surface.

I have tried various simplifications, such as setting the right hand side of the PDEs to 0, and still I don't get any solution.

My question:  Are my PDEs and BCs sensible?  And if so, what do I need to do with pdsolve to get a proper solution?

## How can I implement a simple code to obtain the di...

Let us consider the following assumptions:

Any set of binomials $B \in R=K[x_1, \cdots, x_n]$ induces an equivalence relation on the set of monomials in $R$ under which $m_1∼m_2$ if and only if $m_1−tm_2\in \langle B \rangle$ for some non-zero $t\in K$. As a k-vector space, the quotient ring $R/B$ s spanned by the equivalence classes of monomials. Now let $f =x^2−y^2$ be a binomial in $K[x, y]$. Among monomials of total degree three, $x^3$ and $xy^2$, as well as $x^2y$ and $y^3$ become equal in $K[x, y] / \langle f\rangle$.

Why the degree three part in the quotient is two-dimensional with one basis vector per equivalence class?

Also, why does the polynomial $f=x^3+xy^2+y^3$ map to a binomial with a coefficient matrix [2, 1]? I think this matrix arises from the matrix [1, 1, 1, 0] by summing the columns corresponding to $x^3$ and $xy^2$ and those for $x^2y$ and $y^3$.

How can I implement a simple code to obtain these results in {\tt Maple}?

I am looking forward to hearing any help and guidance.

## Create excel file with sheets of independent varia...

Given a excel sheet with data for regression as input column Y will be a dependent variable

Say a maximum of 120 independent variables are their

A function that takes excel as input with headers as in the excel file

Do pick all possible subsets of maximum size 5 that is sizes 2,3,4,5 only

Pick each and eleminate not to store them all together as otherwise storage will be a problem if more data

Copy only those subsets of independent variables to seperate seperate sheet

Only those subsets

where the variables are independent pairwise between them

Step 2 function

Then need to run a multiple linear regression on these subsets like training and test

And choose the best models I each of cases of number of variable

That is best with 2 variables

Again with 3 variables

Similarly 4 and 5

Atleast if possible upto 2 to 3 variables it will be good kind help with your guidance and what is possible

If you are not able give the program of train test regression with charts no issues

Kind help with atleast storing the independent pairwise subsets of size 2 and 3 into seperate sheets in a Excel file atleast

I will do the regression at my end

## Taking an excel sheet perform operation create new...

I will have excel sheet with minium 500 coulmns and 1000 rows say

For sample to explain my question I attach a demo excel

I am looking to find all 2 way multiplication and add them as columns to my excel sheet and return it as a new excel sheet say

The column names for the new 2 way column should be like the

header name of column you are multiply * the name of the other columsn

Now in sample file if i multiple column with name A with column with name B I get a new column with header A*B the header name should be inserted and

Below that all the elements of that A column multiplied  with that of B should come

I am looking to form columns for all possible2  way multiplication for the excel I will give.

As you can see the demo file

Excel_to_explain.xlsx

## Global setting of character size in maple 2022...

Hello!

I have changed the the global character size from 12 to 14 but it is not stable. Suddenly size 12 is coming up when a try to copy a row to a another row in the same worksheet.

It is very annoying!!

Any tips????

Regards

Kjell

## limit at infinity ...

Dear all

I have an equation obtained from partial derivable of some functions, I would like to compute the limit when my variable named Pe goes to infinity.

I hope to get a more appreciate presentation of my code to obtain the limit (  Pe -> + infty)

limit_infinity.mw

All derivative are well compute, but How can I add the limit as Pe goes to infinity

Thank you

## Issue with Mapleprimes on Laptop...

Hey everyone,

I've been experiencing some issues with Mapleprimes on my laptop. Whenever I try to access the website, it takes an unusually long time to load, and sometimes it doesn't even load at all. This is quite frustrating as I need to use Mapleprimes for my research work. I've tried accessing the website on other devices, and it works fine, so I'm confident that the issue is with my laptop. Has anyone else experienced this problem? Any suggestions on how to fix it?

## Maple on-line help...

Could someone explain to me why the Maple online help pages (see here) are still apparently matching the Maple 2021 release for the past few years? Does this mean that all the information on the Maple online help pages is out of date, or just this one specific page is terribly out of date?

## Kind help to implement the attached flow chart...

Kind help to implement the attached flowchart

Finding_Detour_using_alorigthm.pdf

## Strange Maple response with Font anti-aliasing ena...

Just experienced a strange response from Maple when I changed the Font anti-aliasing to enabled.

With Font anti-aliasing disabled I ran evalf(Pi,100) and Maple returned 100 digits - no problem.  I then did some other errands in other programs leaving Maple idle, when I came back I thought I would change anti-aliasing to enabled and see if maybe that's the reason why some users are experiencing icons disappearing etc..

Well I re entered and evalueated evalf(Pi,100) and Maple only output 10 digits.  Huh??? What!? Why?  changed font anti-aliasing back but no joy.  So I closed Maple and I got a pop up

Maybe it was hiding behind Maple I don't know but I don't think it was there until I closed Maple.  It seems this OpenJDK platform I believe is causing a lot of Maple issues.

Whoa!  That's really odd.  My restart was with Maple Font anti-aliasing enabled I performed a evalf(Pi,100) and no problem.  I changed to Font anti-aliasing disabled and evalf(Pi,100) presented me with 10 digits!

What the heck is going on.  This font anti-aliasing enabled caused my Maple to slow down as the screen filled up (as I recorded in a earlier post months ago) and now toggling anti-aliasing causes the outputs to not work as expected.  It's gotta be an open JDK issue. (FYI closing Maple did not produce the same pop-up as earlier - I expect idling maple for a while might)

## How can i re-install maple 18....

Dear Friends
On 22 March 2018, I received:

ORDER REFERENCE INFORMATION
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Customer: Universidad Nacional Autonoma De Mexico, UNAM
Order Date: 3/21/2018
Order Number: 889668
Customer Purchase Order: 10972
For instaling MAPLE 18

Please see the at bottom of the mail

Best Regards

El 22 mar 2018, a las 11:05, license@maplesoft.com escribió:

Here is your copy of Maple 2018. And this is not a release to ignore!

People use Maple to do many different things, so it’s inevitable that each new release will include some features you care about and some features you really don’t need. However, Maple 2018 contains a large number of substantial enhancements to how you interact with Maple, which means you’ll benefit from this release no matter what you use Maple for.

You are receiving this email because you are a member of the Maplesoft Elite Maintenance Program (EMP). While you participate in this program, you are entitled to new product releases as they come out.

If you are a MapleSim user, note that, unlike in previous years, this email contains only your Maple entitlement information. If you are still an active EMP member when MapleSim is released, we will send your MapleSim information to you at that time.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If you would like a physical copy of your product(s) shipped to you, please go to http://www.maplesoft.com/entitlements. You will need the email address that this email was sent to along with the order number.

ORDER REFERENCE INFORMATION
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Customer: Universidad Nacional Autonoma De Mexico, UNAM
Order Date: 3/21/2018
Order Number: 889668
Customer Purchase Order: 10972

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

================================================================

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The following Purchase Codes activate this product:

[Purchase code deleted]

For the Maplesoft terms and conditions that govern your license to the above noted products, please refer to the Maplesoft End User License Agreement (EULA) found during installation. The Maplesoft EULA can also be found online at http://www.maplesoft.com/documentation_center/Maplesoft_EULA.pdf . You should review the entire Maplesoft EULA prior to activating your products.

SUPPORT
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It is important that you follow the installation instructions contained with each product. If you experience any problems during installation, please visit the Maplesoft online technical support center at http://www.maplesoft.com/support.

For more information on activation, refer to the FAQ page at: http://www.maplesoft.com/support/FAQs/Activation.