Since Maple version 2026, I have noticed that the orientation option with the contourplot3d command has no effect.

It is easy to control by using the example provided in the online help and adding, for example, orientation=[20,10,10].

Thank you for your help.

Best regards.

Hi again Maple community, and others,

want to share
tiwn_and_cousin_prime_numbers.mw
tiwn_and_cousin_prime_numbers.pdf
(spelling error in file name)

~

just want to share,
some successful code

The lesser of the twin primes are listed
{3,5,11,17,29,41,59,71}
https://oeis.org/A001359
Prime numbers p such that p+2 is also a prime number

also, the lesser of the cousin primes are listed
{3,7,13,19,37,43,67,79,97}
https://oeis.org/A023200
prime numbers p such that p+4 is also a prime number

good fun

also, my webpage has more details
https://mattanderson.fun
okay

regards,
Matt

On my system (Windows 11) I can only remove an entry from the favorites when a document is open. With all documents closed removing does not work.

Can someone confirm?

I was using pdsolve to solve for a 1-D longitudinal wave equation.  My particular problem added an external stimulus that is not mechanical in original, so the acoustic wave velocity has to be modeled as a variable c(H) and I also have to add a du/dx term in the model.  You can see my question posted on April 17, 2026.  I was told that pdsolve does not handle such a problem.  The suggestion in the posting is to use a finite difference method.  

I am verifying that approach by solving a simplier problem where c is constant but with an initial uniformly stretched material.  The solution does not seem to be physical.  The material should relax throughout the whole length of the material, but the solution shows relaxation at the end and stay uniformly stretched at the center.  I ran the problem with pdsolve and get a different result that I think is more realistic.

Is there something I can tweak in the finite difference approach to overcome that issue?

pde_finite_difference_method_linear_ic.mw

pdsolve_exercise_damping_ini_linear_a.mw

Is there a workaround to being able to call object method inside the debugger? I use Objects everywhere and hard to debug things when not able to try calls inside the debugger.

Here is an example.

This worksheet below has the code to reproduce this. Ofcourse the code works when I run it in the debugger using "continue" button, or using the "next" or "step". But I need sometimes to check something before doing this.

Download why_calling_object_fail_in_debugger.mw

Please see the attached worksheet:

Question 1:  How to plot a partial portion of an array s2 using "dataplot," say the first 50 elements.

Question 2:  I have also tried to use "plot" to plot the first 50 elements s2 and keep on getting errors or strange looking plot with horizontal lines.  I have tried plot(s2,1..50), plot(s2,x=1..50), plot(s2,m=1..50), plot(s2[m],m=1..50), plot(s2[1..50],1..50], plot(1..50,s2[1..50]).

plot_exercise_a.mw

> kernelopts(version);
Maple 2026.0, X86 64 LINUX, Apr 28 2026, Build ID 2011354

Is the implementation of DataFrames in Maple antiquated compared to PANDAS or other modern implementations of DataFrames? Even doing the most basic tasks is extremely difficult or unintuitive. I have lived in the DataFrame help pages for 5 years and I still can't delete a column from a DataFrame. Will I ever get any work done? 

delete_a_dataframe_column.mw 

Color option in Context Panel does not work

Steps to Reproduce:
1. Create or open a histogram.
2. Try to change its color using the Color option in the Context Panel.
3. Observe that the color does not change.
4. Click outside the histogram.
5. Click back on the histogram.
6. Try the Color option again — now it works.

Expected Behavior:  
The Color option should work immediately when applied to the histogram, without requiring extra clicks.

Actual Behavior:  
The Color option only works after clicking outside the histogram and then reselecting it.

Just for my interest.
Why is the following not working

one := ``(1);
                           one := (1)

 lprint(`%`);
Error, Got internal error in Typesetting:-Parse:-Preprocess : "invalid subscript selector"
Typesetting:-mambiguous(Typesetting:-mambiguous( lprint(%), 

  Typesetting:-merror("Got internal error in Typesetting:-Parse:\

  -Preprocess : "invalid subscript selector"")))

but this works

lprint(one);
``(1)

Maple 2026.1 

We have just released an update to Maple. Maple 2026.1 includes further enhancements to the new AI Assistant and Plotting Themes, as well as Explore, accessibility, and the math engine. As always, we recommend that all Maple 2026 users install this update. 

In particular, please note that this update includes a fix to the problem where titles do not show up when using the Explore commands title option.  As always, thanks for helping us, and your fellow Maple users, by letting us know! 

This update is available through Tools>Check for Updates in Maple, and is also available from the Maple 2026.1 download page on web site, where you can also find more details.  

I do not understand why a once entered prompt cannot be copied from the AI pannel.

I also do not understand that a text passage from an answer (e.g. a proposed help topic) cannot be selected and copied to the clipboard with crtl-c.

It does not make sense to me to unnecessarily restrict a new program feature. This somehow spoils the show.

Is that a restriction to Windows or my local setting or something imposed on Maplesoft from a third party supplier?

Has anybody seen similar AI implementations in other products?

Derive simplifies directly to (1 - a)^3 .

my second Question was deleted by a "moderator" !!!!!!!!! what is this censorship????????? (spam i was told)

Download geodesics.mw

it contained only the file geodesics.mw

Jean-Michel 

Hello Ladies and Gents :)

I asked Maple AI to write a program to calculate the geodesics on a sphere.

see the attached ws.

When running this program I receive an error which I don't understand.

of course i know how to do it by paper and pen, it was just a test.

if someone could explain me this error i would greatly appreciate .

thank you and kind regards,

Jean-Michel

Moderator edit - here is the file:

geodesics.mw