MaplePrimes - Unanswered Questions

pdsolve and finite difference method discrepancy

wingho — Thu, 14 May 2026 15:58:52 Z

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

Color option in context-panel

Geoff — Mon, 04 May 2026 04:53:53 Z

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.

lprint(%) not working

C_R — Sat, 02 May 2026 11:43:12 Z

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)

Problem with uploading worksheet

ianmccr — Fri, 01 May 2026 15:43:11 Z

I was atttempting to ask a question about I problem with styles in the editor in Maple 2026. When I attempted to upload a worksheet showing the problem, my upload was blocked (SQL injection detected). The worksheet is question was, so far as I know, a standard Maple Worksheet containing a module in the start up code editor. How do I successfully upload a maple worksheet?

Copying text from the AI panel

C_R — Wed, 29 Apr 2026 16:22:15 Z

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?

AI code: diff with respect to a function call

Jean-Michel — Tue, 28 Apr 2026 14:45:57 Z

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