Maple knows how to obtain differntials using D.

So typing  D(x*y) it gives   D(x)*y+x*D(y)

But what I want is given as input  D(x)*y+x*D(y) have Maple return back D(x*y)

Nothing I tried work. I tried simplify and convert(...,D) 

I am looking for a function that takes an expression with differentials like the above output, and return, if possible ONE differnetial in the form  D(  f(x,y) )

What I mean, given as INPUT any of these expressions on the RHS in the image below

To return back  the  D(...)  in the LHS above. I know Maple can do it going from the LHS to the RHS. But I want the other way around.

Does Maple support such operations?

Maple 2022.1

If I have a list say 

L:=[1,"2","3",4,5,"6",7,8,9,"10"]

Now i would like to have fuction which takes L as input say    split(L)

and would return two list one with characters from that namely ["2","3","6","10"] and another of integers [1,4,5,7,8,9] like this 

The list will have characters and integers only

Kind help it will be acknowleged

Q1: clicking on a variable in the attached I get

What does it mean and how can I fix that when it happens?

Initialisation_diagnostics_error.msim

Q2: Why are initial conditions which are set to "Ignore" listed as "Guess"?

I intend to use the initialization diagnostics to filter a model for components that have initial conditions set. In the attached example (excerpt from a larger model), this does not work the way I want it to (i.e. I don't want P1 to be listed a guess).

Init_diagnostics_ignore_listed_as_guess.msim

Q3: The app seems to be a powerfull tool. Is it explained somewhere how to use the app to debug a model?

Given a diagonal metric of signature (++- -)  for example the diagonal elements are [1,1,-1,-1], then how to find the Dirac gamma matrix in the standard representation or any representation.

restart;
with(LinearAlgebra);
with(plots);
NULL;

EqBIS := proc(P, U, V) local a, eq1, M1, t, PU, PV, bissec1; a := (P - U)/LinearAlgebra:-Norm(P - U, 2) + (P - V)/LinearAlgebra:-Norm(P - V, 2); M1 := P + a*t; eq1 := op(eliminate({x = M1[1], y = M1[2]}, t)); RETURN(op(eq1[2])); end proc;
NULL;
A := <4, 8>;
B := <4, 2>;
C := <1, 4>;
EqBIS(A, B, C);
NULL;

Cen := proc(M, N, R) local eq1, eq2, sol; eq1 := EqBIS(M, N, R) = 0; eq2 := EqBIS(N, M, R) = 0; sol := simplify(solve({eq1, eq2}, {x, y})); RETURN([subs(sol, x), subs(sol, y)]); end proc;
Cen(A,B,C):

CircleParm := t -> [(-t^2 + 1)/(t^2 + 1), 2*t/(t^2 + 1)];
P1 := Transpose(convert(CircleParm(1/4), Vector));

P2 := Transpose(convert(CircleParm(5), Vector));
P3 := Transpose(convert(CircleParm(-1/10), Vector));
P4 := Transpose(convert(CircleParm(-3/2), Vector));

C1 := Transpose(convert(Cen(P1, P2, P3), Vector));
Pts := [P1, P2, P3, P4, C1];

display(implicitplot([x^2 + y^2 - 1], x = -2 .. 2, y = -4 .. 2, colour = [blue], scaling = constrained), pointplot(Pts, symbolsize = 16));
Error, (in plots:-pointplot) incorrect number of coordinates in points data
NULL;Why this error. Thank you.

How relabel only one particular vertex of G of my choice. others will remain as it is

Function I want to create 

V:=Vertices(G):

Relabel:=proc(Graph::G,S,K)

I want to relabel only that particalur S subset V of G where S is list with say the K is a list of labels to be assigned the corrsponding vertices i paased in S. 

end proc;

Where v:=V[i] the vertex , k can be a character like       a or 1 or [1,2,3,4] or anything

To Maple support,. 

fyi,

internal error generated on this ode when trying odetest
 

Download problem_odetest_july_23_2022.mw

Update 2 years later

FYI, This error is still not fixed in Maple 2024

Download odetest_error_series_august_2024.mw

Will check again in 2-3 years and I am sure this bug will still not be fixed.

He Seniors, How to increase the quality of graph by puting command in ploting command according to required desire

Graph_qaulity_help.mw

Hi,

I found a bug in convert, please help me if you know a solution.

When we use the code

convert(U(xi)^2*y(xi)^5,list);

we get 

[U(xi)^2, y(xi)^5]

but when we use

convert(U(xi)^2,list);

we obtain

[U(xi),2]

while I expect the following result:

[U(xi)^2]

* "convert" is one part of my code for solving a problem. Sometimes there are cases that just exist one function instead of >1.

Since I want to keep my codes general, hence I need [U(xi)^2] in response to convert(U(xi)^2,list).

Thanks in advance.

A polynomial divided by another polynomial of lower degree. I want to find the remainder and quotient. How do I get.

The question is what should I add to the numerator get perfect division when x³ -3 x  -12 x+19 is divided by x²+x-6.

I shd get the answer as 2x+5 to be added since the remainder is -2x-5.   (Note that x³ -3 x  -10 x+24 is excatly divided by ²+x-6.

Can any one state the code to get the answer.

Quotient ( ) and Remainder (  ) codes , i tried, donot know how to use them.

Thanks for help. Cheers. RK

I'm using Maple 2021, and my Euler-Lagrange equation is coming out with a R[0] term that should not be there. I want to know what is causing this error and how I can fix it.

Download Maple_Help_Example.mw

Dear All,

I'm wondering if there is a simple way to define, given a "module" that protects "e" as a global, to allow the user to write e[0], e[1], e[2], e[3], e[inf] such that I calculate with e[4] but I display e[inf]. And if I type in e[inf], it translates behind the curtain of the module e[inf] into e[4] such that I keep my indexes 0-4 for the handling of my entities.

I hope I made myself understood ;)

I was woundering if there is some way with the standard "TypeSetting Module" ?

Sincerely

Ivar 

How can I achieve something like this (i.e. an output in a worksheet)?

It is important that the variables of the lables match the columns.

In the attached file is a typical dataset. A display of row lables would be optional.

Context: Easier interpretation (of the structure) of a Jacobian and subsequent manual solving the equations of interest that correspond to the rows.

Labels_for_sparse.mw

Hi!

I would like Maple to show the full solution method to this pde.  How do I do this?

Show_Solution_to_NLPDE.mw

Hello my friends
Please help me solve the integration problem in the attached Maple code below (why was the integration not done in u[4]?) ... Thank you very much

Download help.mw