Hello all, 

Is there any chance to ask these two questions?

1) What would be the way to pick up the result from 'LPSolve' command? I thought that the command would overlay the result to the input matrix, but I was wrong. 

2) This question is not related to Maple, but I saw that the transportation problem described in the attached worksheet has multiple solutions. In other words, the solution that came up with 'LPSolve' command was different from what the textbook presented, but both of them were legitimate solutions. Therefore, I'm wondering if there is a way to test the uniqueness of the solution. 

In Kwon Park 

Q20220416.mw

I got a solution to use D as a symbol that prints well in italic. For convienience I like to have it in my favorite palette.
When I drag `&D;` from a Maple Input line to the favorites palette, the ampersand and the statement operator are removed. Copy and paste have the same effect on the pasted selection. If  these characters are removed, `&D;` becomes the differential operator D. That's not what I want.
Is it possible at all to get `&D;` or simliar expressions using special characters within left single quotes into the favorite palette?

Hi,

I want to convert BesselJ(n,x) to the spherical version of it.

Is there a defined command in Maple that does this??

For example: 

sqrt(Pi)*sqrt(2)*BesselJ(1/2, x)/(2*sqrt(x))

is equivallent to

sin(x)/x

Indeed, the latter is the spherical version of the former one.

However, I can define a function that does it, see:

SBesselJ := proc (n,x) options operator, arrow, function_assign; expand(simplify(sqrt(Pi/(2*x))*BesselJ(n+1/2, x),'assume = positive')) end proc;

but is there a command that converts some terms to our defined function?? 

Thanks in advance.

Dear all,

I do not understand the output of the "Dual" command in the Logic package.

According to the help:

"The Dual command returns the dual of the Boolean expression b, that is, the expression generated by replacing &and with &or, &or with &and, leaving &not fixed, and extending to the remaining Boolean operators by their formulas in terms of &and, &or, and &not."

Applying Dual to "a &implies b" gives:
  `Logic:-&implies`(`&not`(a), `&not`(b))

But "a &implies b" is equivalent to "&not(a) &or b" and its Dual would be "&not(a) &and b", which is not equivalent to the result Maple returns.

Best regards,
 Anthei

Ha := 5; Gr := 2; Pr := 8; b := 4; lambda := 3;
PDE := {diff(theta(x, t), t)-(diff(theta(x, t), x, x))/Pr = 0, diff(u(x, t), t)-(diff(u(x, t), x, x))+Ha*u(x, t)-Gr*theta(x, t) = 0};
IBC := {theta(0, t) = 1+b(1-cos(lambda*t)), theta(1, t) = 1, theta(x, 0) = 0, u(0, t) = 1-cos(t), u(1, t) = 1, u(x, 0) = 0};
      {theta(0, t) = 5, theta(1, t) = 1, theta(x, 0) = 0, 

        u(0, t) = 1 - cos(t), u(1, t) = 1, u(x, 0) = 0}
pds := pdsolve(PDE, IBC, numeric);
                          module()...end module

how we can expand module()...end module and see solutions of the problem.
 

How to solve the following system of ode analytically in maple?

diff(s(t), t) = gamma*s(t) + eta*s(t) + sigma*m(t)*s(t) - kappa*s(t) - phi*s(t), diff(g(t), t) = -alpha*g(t)*m(t) + mu*g(t) + delta*s(t)*g(t), diff(m(t), t) = beta*s(t) - alpha_1*g(t)*m(t)

Hi there.

There is some floating bug in Thread-Seq.

Maple is crashing sometimes (not always, 50/50) after running the script below:

thread-seq_error.mw

What's going on?

Hi,

I am a newbie in Maple. I have the following code

with(LinearAlgebra):
w := (2*Pi)/14
v := Vector([1, sin(w*t), cos(w*t)])
simplify(sum(v . (Transpose(v)), t = k .. k + 13))

Even with some less advanced CAS I get that the result is a diagonal matrix with constant elements. However, I failed to properly tune the simplify command to get such a result. What I am doing wrong?

I have two questions:

1) How can I select only parts of an equation in a Maple Workbook? E.g. I have

4*x^2*(1 + x)^2*(x^2 + 6*x + 1)

and I want to select the text between the first "2" and the "6", but Maple always extends the selection to include the complete bracket. This is very annoying :)

2) How can I copy text from a maplesoft page into a workbook. E.g. I'm looking at

https://www.maplesoft.com/support/help/maple/view.aspx?path=updates/Maple2021/ODEsandPDEs

and I would like to select and copy some of the shown examples so that I can use them.

I believe I have found a bug or unintended behaviour:

The following second-order DE:

mplinput := ((x^4 + 4*x^3 + 10*x^2 + 4*x + 1)*diff(y(x), [x $ 0]))/(4*x^2*(1 + x)^2*(x^2 + 6*x + 1)) + 2*(x^2 + 5*x + 2)*diff(y(x), [x $ 1])/((1 + x)*(x^2 + 6*x + 1)) + diff(y(x), [x $ 2])=0:

can be solved by

with(DEtools):
hypergeometricsols(mplinput);

in terms of hypergeom functions. However,

dsolve(mplinput, [hypergeometricsols]);

does not find a solution, although it is supposed to use the same algorithm. One can trace this back to the sub-algorithm 'DEtools/2F1: --- find_2f1 ---' which is apparantly used by hypergeometricsols, but not by dsolve.

Another thing is that dsolve(mplinput, [hypergeometricsols]) in fact works in Maple2020, but does not in Maple2021 and Maple2022.
 

Hi, 

I installed syrup within Maple 2022 according to the procedure described in syrup's README file. The installation seems to run normally. After that I restarted Maple. When I now enter

with(Syrup);

it shows

[Draw, Library, Print, Solve, ToModelica, ToSpice, Version]

instead of 

[deindex, makecheckttable, printdeck, reindex, syrup]

as described in the application center: https://www.maplesoft.com/applications/Preview.aspx?id=4680

Also the example which is decribed there doesn't work:

syrup(divider, dc, 'curr');

delivers no result.

I'm working on Windows 10 64 bit.

Could it be that syrup is not yet prepared for Maple 2022, as it seems not to be updated for a long time? Or is the description in the application center not up to date?

Many thanks for your help!

Best regards,

Michael

Hi,all

I am new in Maple,when I execute the "InversePlot" command ,all functions were correct except for exp(x), error occurs as follows, can anyone tell me what mistake I took?

Tks in advance!

restart;
with(Student[Calculus1]);

InversePlot(exp(x), -1 .. 1);
Error, (in Student:-Calculus1:-InversePlot) module does not export `IsTrigProc`
 

Tks for all you guys. 

I have uninstall Maple and deleted the installed directory ,clear the register,reinstall Maple 2022, now all works well.

I think the problem is I installed Maple 2022 in the old directory of 2021for keeping my configuration,this caused much unexpected problem

I want to create a variable that is made up of a letter and an arrow on top. How to do that?

Also, how can I create a variable that is bold? I tried to type it as bold and then assign. But when I hit return it returns a normal symbol.

How to distinguish between a scalar variable and a vector variable in Maple?

Hi,

I want to solve a differential equation and plot the particle densities versus the distance.

How can I do this in Maple?

DE.mw

Sincerely