Unanswered Questions

This page lists MaplePrimes questions that have not yet received an answer


exploring this package for a graduate course (to physicists, actually).

When calculating diatomic potential energy curves for Ar-F (using Parametric2RDM, or CC) I am running into trouble,

a discontinuity appears at about R=3 Angstroms.

This happens for many wavefunction sets (cc-pVXZ with X=D,T,Q,5, also augmented set on F)

The problem might be basis set superposition error (BSSE), treated usually by counterpoise, i.e., doing the monomer calculations with the molecular basis, by putting in ghost basis for the other atom at the given distance R.

I couldn't figure out whether, in fact, the package supports some treatment at this level, and/or if it does, how to implement it.


many thanks



Hi, when I tried the simple example of Java OpenMaple on Mac, I can compile the code but couldn't run it. It complained about not finding libjopenmaple.jnilib. I checked that library directory, there was /libjopenmaple.jnilib but not libmaplec.dylib. Any suggestions?

> java -Djava.library.path=/Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX -classpath "$MAPLE/java/externalcall.jar:$MAPLE/java/Maple.jar:." test

Error loading libraries: java.lang.UnsatisfiedLinkError: /Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX/libjopenmaple.jnilib: dlopen(/Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX/libjopenmaple.jnilib, 1): Library not loaded: @rpath/libmaplec.dylib
  Referenced from: /Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX/libjopenmaple.jnilib
  Reason: image not found
java.lang.UnsatisfiedLinkError: /Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX/libjopenmaple.jnilib: dlopen(/Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX/libjopenmaple.jnilib, 1): Library not loaded: @rpath/libmaplec.dylib
  Referenced from: /Library/Frameworks/Maple.framework/Versions/2021/bin.APPLE_UNIVERSAL_OSX/libjopenmaple.jnilib
  Reason: image not found
    at java.base/jdk.internal.loader.NativeLibraries.load(Native Method)
    at java.base/jdk.internal.loader.NativeLibraries$NativeLibraryImpl.open(NativeLibraries.java:383)
    at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:227)
    at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:169)
    at java.base/jdk.internal.loader.NativeLibraries.findFromPaths(NativeLibraries.java:316)
    at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:282)
    at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2440)
    at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:809)
    at java.base/java.lang.System.loadLibrary(System.java:1893)
    at com.maplesoft.openmaple.Engine.<clinit>(Engine.java:23)
    at test.main(test.java:22)
Exception in thread "main" java.lang.UnsatisfiedLinkError: 'long com.maplesoft.openmaple.Engine.getKernel(java.lang.String[], com.maplesoft.openmaple.EngineCallBacks, java.lang.Object, java.lang.Object)'
    at com.maplesoft.openmaple.Engine.getKernel(Native Method)
    at com.maplesoft.openmaple.Engine.<init>(Engine.java:44)
    at test.main(test.java:22)



Since I installed Maple 2021 I have noticed a problem with the left corner of the menu and toolbar.  See the screenshot attached. I don't know if this is a general problem in Win10 or is this a problem with my installation.

Whenever i press F5, Maple will switch to nonexecutable math so I have to press it once more to go to math. This is very annoying. I would very much like to have it just switch between math and text when i press F5 like it used to do. 
How do I make it so?

Please help.

I tried to change my email on my account, and got a message that an email was sent to confirm, but never got an email.
I may have more than one account, because I tried to change my user name, but I can't log onto that account so I tried password reset, and the same thing. I got a message that an email was sent, but I haven't received that either.

I'm logged in now, but I suspect I won't be able to get back in.

my email is mgmcderm@gmail.com

I've noticed after a creating a few documents that when save such documents as PDFs on my Mac, the drawing elements in my drawings are misalgined. Is this just a bug or is there a way to prevent this?  I've attached screenshots of the correct drawign in a document and what the result is in a pdf.


How to solve Linear first-order PDE by the Lagrange method?

dx/(x) =dy/0=dt/0=du/3=dv/v=dw/w, where x,y,t are independent variables and u,v,w are dependent variables.


I have used Maple almost daily for the last four years, but a few days ago two students approached me with an issue I had never encountered before. However, it had happened to both of them within a few weeks.

They described the issue as follows: When they opened a random Maple document and they tried to type in simple operators (like +, - or *), Maple would instead write an odd symbol, which none of them recognised as a mathematical symbol.

As they could not find a way to solve the problem within Maple, they tried restarting their computers. When they afterwards reopened Maple, the problem was gone and the operators worked as expected again. Neither of the students has experienced the issue since.

During the last few days, I have been trying to replicate the issue myself without success. Therefore, I also don't have any screenshots to share, so hopefully my simple explanation is enough.

My questions are: Has anyone heard about this issue before? Does anyone know what might have caused it? Is there a way to replicate it and/or prevent it from happening again in the future?

I hope someone is able to clarify it a bit for me! :)



How can I use symbols from the Emoji and Symbols collection on a Mac in a document or worksheet in Maple? I want to create documents but I find symbols not included in Maple that I require. I have found that some symbols will stay in the document if I insert them when in TEXT mode, but that does not work when entering a fraction for example and needing a symbol. When reloading a previously saved document, I find that the symbol has not saved.


A related question: how can I expand on the default symbols in the toolboxes?





For debbugging big programs, i have been told that one good solution is to use the mint application.

I'm trying to do so that is to say to use the mint application with windows. But, i encounter some difficulties.

The program on which i would like to apply the mint is composed of several parts like in the package Shapes and the different parts of the module are called thanks to the $include syntax.

To test mint, i have launched a command window with the command cmd in windows.

After, i apply cd PathRepertoryContainingMint

On i am located in this repertory, i test the following syntax :
mint -I PathRepertoryContainingTheDifferentFiles PathRepertoryContainingTheMainProgram\program.mpl

In my case these two paths are the same.

I test also the following syntax:

mint -o PathRepertoryContainingTheOuput\mintoutput.mpl PathRepertoryContainingTheMainProgram\program.mpl

It may run but i don't know where i can recover the output of mint

I have been told also to set the Windows PATH variable to include the Maple bin directory (thank you @Joe Riel for this tip). I think that it should be a good idea but I never do this type of manipulation.

On the net, I find that the process to do so is the following : setx path "%path%;c:\directoryPath"


1) If you have some experience in using mint with windows, may you give some tips (precise the right syntax) to use it ? 

2) In case the option -o is not used, where the output of mint is coming ?

I thank you in advance for your help.

Using a Cyrillic font in the Combo Box component gives an runtime error when saving workbook file (*.maple file extension).


Select the second item in Combo Box component and press save button.


Dear maple users,


In this code, the problem has executed. But I unable to get the graph.
Kindly do the needful to plot the figure at time t=0.45.
Also, please explain how to import the computed values into an excel file.

Waiting for your reply.JVB.mw






proc (z) options operator, arrow; piecewise(beta <= z, (1+xi*z)*(1-(32/5)*eta[1]*((11/32)*z-(11/32)*beta-(47/48)*(z-beta)^2+(z-beta)^3-(1/3)*(z-beta)^4)), z <= beta+3/2, (1+xi*z)*(1-(32/5)*eta[1]*((11/32)*z-(11/32)*beta-(47/48)*(z-beta)^2+(z-beta)^3-(1/3)*(z-beta)^4)), 1+xi*z) end proc



PDE :=ra*(diff(f(x,t),t))=+b1*(1+ea*cos(t))+(1/(x*R(z)^2))*diff((x*(m+(1-m)*(1+(we*we*((diff(f(x,t),x)))^((na-1)/2)))^(-1))*(diff(f(x,t),x))),x);

PDE := diff(f(x, t), t) = 4+2.0*cos(t)+((.7+.3/(1+.25/(diff(f(x, t), x))^.1500000000))*(diff(f(x, t), x))+0.1125000000e-1*x*(diff(f(x, t), x, x))/((1+.25/(diff(f(x, t), x))^.1500000000)^2*(diff(f(x, t), x))^.150000000)+x*(.7+.3/(1+.25/(diff(f(x, t), x))^.1500000000))*(diff(f(x, t), x, x)))/(x*piecewise(.5 <= z, 1.440000000-.8800000000*z+2.506666667*(z-.5)^2-2.560000000*(z-.5)^3+.8533333331*(z-.5)^4, z <= 2.000000000, 1.440000000-.8800000000*z+2.506666667*(z-.5)^2-2.560000000*(z-.5)^3+.8533333331*(z-.5)^4, 1)^2)


IBC := {D[1](f)(0,t)=0,f(1,t)=0,f(x,0)=0};

{f(1, t) = 0, f(x, 0) = 0, (D[1](f))(0, t) = 0}




sol := pdsolve(PDE, IBC, numeric, spacestep = 0.1e-1);

module () local INFO; export plot, plot3d, animate, value, settings; option `Copyright (c) 2001 by Waterloo Maple Inc. All rights reserved.`; end module






Download JVB.mw



Does anyone use maple calculator?


I am trying to use it on my iPad for matrix functions.


I tried standard maple %T for transpose, get an error.  I've tried -1.  No joy.  

I can't seem to find how to assign to a variable, or use indexing to a matrix element.


Any suggestions welcomed for iPad maple functionality. 


I am having trouble with a Lie algebra cohomology computation. Suppose I have a poset on {1,2,3,4} where 1 < 3, 1 < 4, 2 < 3, and 2 < 4. I can express this as a matrix:

* 0 * *
0 * * *
0 0 * 0
0 0 0 *

where *'s mean "any entry in my ground field," say R or C, and 0s are 0s. Basically, if there is a relation between row i and column j, there is a *. This is why there is a * in row-1 and column 3, as 1<3, but a 0 in row-1 and column 2. I can make the collection of all of these matrices into a Lie algebra using the commutator, as it is closed, and can further suppose it is of trace 0 - that is, it is Type A.

My question is this: I know this algebra has non-trivial cohology, and deforms. However, I want to make Maple do this for me, so I can try it on bigger algebras - however it always tells me that the cohomology is dead zero. What am I doing wrong? My approach is this:

Let P equal the following collection of matrices - these form my basis:

 [Matrix(4, 4, [[1, 0, 0, 0], [0, -1, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]), Matrix(4, 4, [[0, 0, 1, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]), Matrix(4, 4, [[0, 0, 0, 1], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]), Matrix(4, 4, [[0, 0, 0, 0], [0, 1, 0, 0], [0, 0, -1, 0], [0, 0, 0, 0]]), Matrix(4, 4, [[0, 0, 0, 0], [0, 0, 1, 0], [0, 0, 0, 0], [0, 0, 0, 0]]), Matrix(4, 4, [[0, 0, 0, 0], [0, 0, 0, 1], [0, 0, 0, 0], [0, 0, 0, 0]]), Matrix(4, 4, [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 1, 0], [0, 0, 0, -1]])]

Now I can run the basic commands to get started:

L := LieAlgebraData(P, Ex1);

I can now go straight to cohomology. If my algebra is named L, then I want to build my cochain complex C^*(L, L):

c := RelativeChains([e1,e2,e3,e4,e5,e6,e7]);

However, the answer is always that there are no non-trivial cochains: the answer is [[], []]. This will make it very difficult to have non-trivial cohomology.

I know this isn't true (see https://arxiv.org/pdf/1407.0428.pdf). I also tried the approach in the Maple documentation, where I work in the adjoint representation. This gave me non-trivial cochains, but the cohomolgy was 0.

Does anyone know what I'm doing wrong?



I spent some hours to manipulate the Nabla operator as in textbook, but i have an issue.

Thank you for your help

First thing i did is :

with(Physics); with(Vectors);

I declare S0 and P0 as constant with


I have the expression

Exp := S0*(P(x, y, z, t) * - P0)

I apply the Nabla Operator and get

(%Nabla) S(x, y, z, t)) = S0*Nabla, P(x, y, z, t) * - S0*NablaP0

As S0 and P0 are constants, How to remove the S0*NablaP0 term  ?

I tried some combinations of expand and simplify.

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