MaplePrimes - Maple Posts and Questions

Check procedure existance

Anthrazit — Tue, 16 Jun 2026 20:19:49 Z

I'm trying to rewrite my initialization routines a bit, and want to find out if there are any other procedures with a certain name that should be called.
However there seems to be a problem with the scope. I'm trying to explain that with a little program.

The question is - why is InitSpecific not found by the InitCommon procedure here?

Download InitCommon.mw

Animating the Dzhanibekov effect?

Earl — Tue, 16 Jun 2026 18:40:37 Z

The uploaded worksheet references two youtube videos.

The first one displays the animation of a simple device rotating about an axis tilted at a small angle from the device's principal axis having an intermediate moment of inertia.

The animation and accompanying verbal description demonstrate the Dzhanibekov effect.
The second video contains the first video's narrator's equations which produce the values used in creating the animation.

The uploaded worksheet contains my failed attempt to reproduce these values.

Please suggest the Maple 2020 compatible statements which correctly produce these values.

Dzhanibekov_effect.mw

evala,Sqrfree output

C_R — Tue, 16 Jun 2026 16:10:35 Z

I am new to evala (and the math behind).

On ?evala,Sqrfree at the first bullet point I was wondering if there isn't a "u" missing here

Can someone confirm?

How does this divergent series get evaluated?

Angelo Melino — Mon, 15 Jun 2026 19:12:19 Z

I asked an LLM to provide an expansion of the MacDonald function of arbitrary order (a modified Bessel function of the second kind with purely imaginary order and positive argument), K(I*y,r), as a weighted sum of MacDonald functions of integer order. It came back with

K(I*y,z)=2*sinh(Pi*y)/Pi* [K(0,r)/2*y+sum( (-1)^n*y*BesselK(0,r)/(y^2+n^2),n=1..infinity)]

(see below for more readable text)

I evaluated the LHS and RHS using Maple 2026 for various choices of y and r and found numerical agreement using both "sum" and "Sum". I was very pleased until I realized that the RHS isn't a convergent series!

Can anyone explain to me how Maple pulls this off!

(I asked Maplesoft Tech Support but they said it is above their pay grade... I suspect that Maple is using Borel summability to evaluate the RHS but I haven't been able to verify that)

I apologize, but I can't see how to attach a .mw file, so I've cut and pasted the code below

why not to collect R(xi) accurately

bashar27 — Mon, 15 Jun 2026 08:21:07 Z

restart;

T := R(xi)*R(xi) + lambda;

u := A[0] + A[1]*R(xi) + B[1]/R(xi);

d[1] := A[1]*T - B[1]*T/R(xi)^2;

d[2] := 2*A[1]*R(xi)*T - 2*B[1]*T/R(xi) + 2*B[1]*(R(xi)^2 + lambda)*T/R(xi)^3;

expand(((-alpha^2*b^2 + a^2)*alpha^2)/(2*beta)*d[2] + (omega + alpha^2*(alpha^2*l^2 + k^2)/2 - a*C[1]/(-alpha^2*b^2 + a^2))*u[0]/(beta - 2*beta*a^2/(-alpha^2*b^2 + a^2)) + u[0]*u[0]*u[0]);

value(%);

simplify(%);

collect(%, R(xi));

/ 6 4 4 2\ 3
A[1] \-alpha b + a alpha / R(xi)
------------------------------------
/ 2 2 2\
beta \alpha b + a /

/ 6 4 4 2\
A[1] lambda \-alpha b + a alpha / R(xi)
+ ------------------------------------------ +
/ 2 2 2\
beta \alpha b + a /

/ /
1 |/ B[1] \ |
--------------------- ||A[0] + A[1] R(xi) + -----|[0] |beta
/ 2 2 2\ \\ R(xi)/ \
beta \alpha b + a /

2
/ 2 2 2\ / B[1] \
\alpha b + a / |A[0] + A[1] R(xi) + -----|[0]
\ R(xi)/

1 2 2 6 1 / 2 2 2 2\ 4
+ - b l alpha + - \-a l + b k / alpha
2 2

\\
/ 1 2 2 2 \ 2 2 ||
+ |- - a k + b omega| alpha - a omega + a C[1]||
\ 2 / //

/ 6 4 4 2\
B[1] lambda \-alpha b + a alpha /
+ ------------------------------------
/ 2 2 2\
beta \alpha b + a / R(xi)

6 4 2 4 2 2
-alpha b lambda B[1] + a alpha lambda B[1]
+ ------------------------------------------------
/ 2 2 2\ 3
beta \alpha b + a / R(xi)

Stacked tabs for open worksheets

nm — Sun, 14 Jun 2026 13:01:03 Z

WHen I open many worksheets at same time, say 10. The new UI do not stack them all (i.e. the tab at the top), forcing one to use the small arrow to navigate to each worksheet.

Is there a way to tell the UI to show all tabs (may be double rows and 3 rows as needed) to make it easier to jump from one worksheet to the other?

I do not know if this is new feature in the new ribbon UI or not.

Here is screen show where I have 10 worksheets open

There is also a pull down menu, but it only shows 8 worksheets and one can have more open but they do not show. So have to scroll down looking for the rest. Even that does not work well. many times when I try to scroll down, the window closes. It will not give me time to move the mouse to the scroll bar to move it before it closes.

Both of these solutions are not good. Having to use the arrow key to look and navigate for a different worksheet is bad UI design.

How to see all tabs for all open worksheet in same UI? If the tabs do not fit on one row, why not make second row? If two rows do not fit, make 3rd row. This should be an option for the user. But I did not see one so far. But will keep looking.

I find tabs where all worksheet show much better design that this UI design.

I only use worksheet and not document mode. Windows 10.

To give you idea what I mean, These are examples found on the net of stacked tabs

Where in Maple, each tab above will have the name of the worksheet open. Font can be small, is OK.

Is it possible to have this in the new UI for open worksheets?

One option I might try to make my worksheets names much shorter. May be then they will fit all in same window.