MaplePrimes Questions and Posts

These are Posts and Questions associated with the product, MaplePrimes

When creating my account I was asked what type of user I am. Academic,Commercial, Government or Student.  None of those applies to me but I had to pick one.  Might I suggest a "catch all" category?  Something like "Ordinary, average guy" who just happens to like your software.

Happy New Year.👍

This text is typed directly into the browser. I can now change the font size to something bigger. I can also change the font from Default to something else.

This text in Calibri 11 was pasted from Word. What do I have to do to change it to MaplePrimes default font (which I have used above)? Selecting default from 

does not work because default is already selected when I put the cursor into the pasted text.

What is the default font type by the way? Can I change it permanetly?

All on Windows 10 and with Firefox.

It's becoming increasingly common for questions to be deleted, the most frequently evoked argument being that they duplicate earlier questions.
Usually it's the author of the question who complains, in this case it's the one who provided an answer.

I've always found this self-given freedom on the part of moderators somewhat inappropriate, especially given that these deletions are done on the sly, without even the courage to be explicitly claimed by their authors.

Couldn't these latter take the time to leave a message indicating what they've just done (and why) and where the deleted question, and any exchanges associated with it, can be found?
Otherwise, this attitude is more akin to contempt and censorship than to real management of this blog.

A few years ago, when I came to this site, these deletions were the exception and I can only deplore the fact that they have become commonplace.
They say that life is better elsewhere, I don't know, but what I do know is that I've never come across this on any Scilab, R, SageMath or OpenTurns user's blog.

Anyway, here's the reply I sent to @salim-barzani :  Hirota_derivative_KdV_equation.mw

I currently have problems uploading

i am not jobles to post in here and you delete them one by one, when i post i am waiting for response not you delete them, with this cuase my question are repeat or something like that 
this time delete my post i will upload 1000 of nonsense question and post  and go delete all of them ...

I notice a LOT of posts/answers being deleted.  Why?  What is the purpose of this destructive nature?

To mapleprimes administrators - Please restore deleted content not related to spam. 

If it is some disgruntled mapleprimes user, I'm only guessing, but just because someone didn't reply or upvote a particular answer doesn't mean it isn't good.  Lost knowledge on mapleprimes is just the first sign of a collapsing civilization ... well .. maybe that's a bit of a stretch. 

It still begs the question, why?

I just realized that voting for a deleted answer is possible. This does not make sense. Does an upvote also change the reputation?

You can try it in the answer to myself below, but please do not upvote permanetly for this question.
 

With the 2024 Maple Conference coming up this week, I imagine one of two of you have noticed something missing. We chose not to have a Conference Art Gallery this year, because we have been working to launch new section of MaplePrimes:  The MaplePrimes Art Gallery. This new section of MaplePrimes is designed for showing off your Maple related images, in a gallery format that puts the images up front, like Instagram but for Math.

To get the ball rolling on the gallery, I have populated it with many of the works from past years' Maple Art Galleries, so you can now browse them all in one place, and maybe give "Thumbs Ups" to art pieces that you felt should have won the coveted "People's Choice Award".

Once you are inspired by past entries, we welcome you to submit your new artwork!  Just like the conference galleries, we are looking for all sorts of mathematical art ranging from computer graphics and animations, to photos of needlework, geometrical sculptures, or almost anything!  Art Gallery posts are very similar to regular MaplePrimes posts except that you are asked to supply an Image File and a Caption that will displayed on the main Gallery Page, the post itself can include a longer description, Maple commands, additional images, and whatever else you like.  See for example this Art Gallery post describing Paul DeMarco's sculpture from the 2021 Maple Conference Gallery - it includes an embedded worksheet as well as additional images.

I can't wait to see what new works of art our MaplePrimes community creates!

 

For a month I did do not get email notfications.

I checked spam folders, settings and email filters.

Is it only me?

Chrome autofills my "Search Questions:" field on https://www.mapleprimes.com/questions/. Does anyone know a prompt way to correct this?


A few times ago I asked a question about the best way to upload a bunch of files and was told that I had to create a zip file and upload it.

The post I want to create is about the packing of "balls" in "unit boxes" (in arbitrary dimension). I have about 10 Maple worksheets and more than one thousand result files (likely about a hundred of hours of computation).
The size of the zip file is about 260 Mb and the link cannot be inserted (it does not even appear in the list of the uploadable files).

What do you recommend?

TIA

@sand15 answered my question but I cannot reply to him. Preview is ok. When I press 'Submit' there is a blue bar and a dot running from the left to the right. It never stops. Why?

I have created a document on my computer that runs normally in Maple 2024.1. However, when I upload this document to MaplePrimes, it shows an error or behaves unexpectedly. The document contains a system of differential equations, which I solved numerically and plotted, but the plots and equilibrium points do not display correctly after uploading.

 

When I run this code on my local machine, it works perfectly. However, after uploading the document to MaplePrimes, it does not run as expected. What could be causing this issue? Is there a known problem with Maple 2024.1 when uploading documents, or could there be a compatibility issue with MaplePrimes?

Any help or suggestions would be greatly appreciated. Thank you!

This project discusses the predator-prey system, particularly the Lotka-Volterra equations, which model the interaction between two species: prey and predators. Let's solve the Lotka-Volterra equations numerically and visualize the results.

NULL

NULL

alpha := 1.0; beta := .1; g := 1.5; delta := 0.75e-1; ode1 := diff(x(t), t) = alpha*x(t)-beta*x(t)*y(t); ode2 := diff(y(t), t) = delta*x(t)*y(t)-g*y(t); eq1 := -beta*x*y+alpha*x = 0; eq2 := delta*x*y-g*y = 0; equilibria := solve({eq1, eq2}, {x, y}); print("Equilibrium Points: ", equilibria); initial_conditions := x(0) = 40, y(0) = 9; sol := dsolve({ode1, ode2, initial_conditions}, {x(t), y(t)}, numeric); eq_points := [seq([rhs(eq[1]), rhs(eq[2])], `in`(eq, equilibria))]

[[0., 0.], [20., 10.]]

(1)

plots[odeplot](sol, [[t, x(t)], [t, y(t)]], t = 0 .. 100, legend = ["Rabbits", "Wolves"], title = "Prey-Predator Dynamics", labels = ["Time", "Population"])

 

``

NULL

NULL

sol_plot := plots:-odeplot(sol, [[x(t), y(t)]], 0 .. 100, color = "blue"); equilibrium_plot := plots:-pointplot(eq_points, color = "red", symbol = solidcircle, symbolsize = 15); plots:-display([sol_plot, equilibrium_plot], title = "Phase Portrait with Equilibrium Points", labels = ["Rabbits", "Wolves"])

 

Now, we need to handle a modified version of the Lotka-Volterra equations. These modified equations incorporate logistic growth fot the prey population.

 

 

restart

alpha := 1.0; beta := .1; g := 1.5; delta := 0.75e-1; k := 100; ode1 := diff(x(t), t) = alpha*x(t)*(1-x(t)/k)-beta*x(t)*y(t); ode2 := diff(y(t), t) = delta*x(t)*y(t)-g*y(t); eq1 := alpha*x*(1-x/k)-beta*x*y = 0; eq2 := delta*x*y-g*y = 0; equilibria := solve({eq1, eq2}, {x, y}); print("Equilibrium Points: ", equilibria); initial_conditions := x(0) = 40, y(0) = 9; sol := dsolve({ode1, ode2, initial_conditions}, {x(t), y(t)}, numeric); eq_points := [seq([rhs(eq[1]), rhs(eq[2])], `in`(eq, equilibria))]

[[0., 0.], [100., 0.], [20., 8.]]

(2)

plots[odeplot](sol, [[t, x(t)], [t, y(t)]], t = 0 .. 100, legend = ["Rabbits", "Wolves"], title = "Prey-Predator Dynamics", labels = ["Time", "Population"])

 

``

 

 

plots:-odeplot(sol, [[x(t), y(t)]], 0 .. 50, color = "blue"); equilibrium_plot := plots:-pointplot(eq_points, color = "red", symbol = solidcircle, symbolsize = 15); plots:-display([plots:-odeplot(sol, [[x(t), y(t)]], 0 .. 50, color = "blue"), equilibrium_plot], title = "Phase Portrait with Equilibrium Points", labels = ["Rabbits", "Wolves"])

 

NULL


 

Download predator_prey.mw

If I'm not mistaken Mapleprimes doesn't accept m files nor folders.

TIA

When I began posting replies or answers in Mapleprimes I remember Carl Love explaining me the difference between them.
I was a newbie by then but I think I've grown up and now I know the difference between a reply and a comment.
For reasons of my own, which I will perhaps explain in a post one day, I have decided to sent only comments and no more answers.

Unfortuntely administrators, or maybe a robot, keep turning my comments into answers.
Which in turn forces me to convert these answers into comments, which are then converted back into answers... which may never end and is a complite waste of time.

Is there a way to declare that I want my choices to be respected?

(For the record I've even written in the header of my comment that I didn't want it to be converted into an answer, but the comment was removed and the conversion done !)

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