MaplePrimes - Newest Questions

How to make units come out as I need?

Mac Dude — Wed, 08 Jul 2026 15:51:43 Z

I am adding 'specificheat' as a property to the Element database in Maple.

In my .mapleinit I have added the property so it is permanent

I have a Package that loads the values in from a table using

ScientificConstants:-ModifyElement(parse(elemt),specificheat=[value=data[i,4]*1000,units='J/kg/K']);

which runs in a loop for all elements I have values for. This all works.

My issue: GetUnit() returns a unit of m^2/(s^2*K). While this is not wrong, I want it to stay J/(kg*K), which is much more suitable for my work (and, besides, is the SI unit for specific heat). I can use convert to fix it on a case-by-case basis, but that is decidedly clumsy.

Is there a way to do that?

This is in Maple 2015. I have access to Maple 2023 as well, but not where I am right now. I really need this to work on all of them.

TIA,

M.D.

PDETools:-dchange example

Rouben Rostamian — Tue, 07 Jul 2026 17:22:19 Z

In the following example, the result of PDETools:-dchange() is unexpected. This may be due to my misunderstanding of the documentation, or (hopefully not) a bug. Any comments?

restart;

>	with(PDETools):

Differential equation over :

>	de := diff(u(x),x) + x*u(x) = 0;

Transform the domain from to :

>	tr := x = 5*xi, u(x) = v(xi);

>	dchange({tr}, de, {xi, v(xi)});

That's good. Now do the same thing to a generic first order ODE:

>	DE := F(x,u(x),diff(u(x),x));

>	dchange({tr}, DE, {xi, v(xi)});

That's not good. The first argument of which was , should have changed to .

Download dchange-problem.mw

dsolve programming example

Earl — Tue, 07 Jul 2026 13:32:58 Z

The two uploads are my attempt to solve Problem 177 in the book "200 More Puzzling Physics Problems" by authors Peter Gnadig, Gyula Honyek and Mate Vigh.

The first upload of a conducting rod moving with initial velocity along two arms of a triangle in a perpendicular constant magnitic field successfully produces an animation.

The second upload of the rod moving on the arms of a parabola produces a puzzling error message when executing the ODE

What actual error in the ODE results in this error message?

What changes to the worksheet will result in successful execution of the ODE and a successful animation?

Rod_triangle.mw

Rod_parabola.mw

eBook help video?

Ronan — Tue, 07 Jul 2026 12:01:16 Z

Are there any demonstration help videos on creating an eBook? Currently I am struggling with the pages Having a laid out example would really help.

I would like to do an eBook version of my help pages to send to some people. Hopefully I can use the current help worksheets. The are formatted based on the Maple help structure.

My currrent structure in the help section is:

Rational Trigonometry

(about 40 help topics)

RTProjective

(about 20 help topics)

UHG

(about 20 help topics)

Edit:- I have made a small step of progress using the " Assistant eBook template" but I am getting this error on build. I don't know how to find the cause of the error.

How to solve the equation?

Alfred_F — Tue, 07 Jul 2026 08:23:01 Z

I would like to solve an equation in the attached file as an exercise. I am looking for all solutions - including the complex ones. This is easily done using "derive". There are six solutions:

edited "test":

test.mw

Five are complex, and the single real solution can be guessed simply by taking a close look. I am unable to obtain the complete solution in Maple; I cannot find my mistake and would appreciate some advice.

Formal Power Series

Roy Hughes — Mon, 06 Jul 2026 02:03:26 Z

I tried to evaluate the function

convert(BesselJ(nu, x), FormalPowerSeries)

only to obtain the Error message

Error, (in convert/FormalPowerSeries) input contains no or more than one variable.

Seems a rather strange error. I thought it would treat x as a single variable