Please, how do I fix this? I have

n := Vector[row]([cos(theta(x, y, t)), sin(theta(x, y, t))]);

and Tried :

sum(Multiply(n[i], n[i]), i = 1 .. 2)

But received: "Error, bad index into Vector".

I cannot. If I right click on the warning I get only a copy option

Double_Pendulum_warning.msim

Hello,

Can we impliment Artificial Neural Network for nonlinear coupled ODE equation with boundary conditions.? In maple

I wont seen any post regarding ANN in mapleprime.

Hello,

I am trying to evaluate this expression numerically or symbolically without success.

> sum(1/(4.0*n^2-4*n+4*100000000^2+1)/10^n,n=1..infinity);

Maple is having hard time to convert it to LerchPhi and even more to evalf(%);

PS : mathematica is doing it at any precision very fast or can translate this into hypegoemetric.

PS2 : I use maple 2020 on windows 10 64 bits.

I use PDsolve to solve sets of PDEs analytically.

I have had tremendous success with this but recently realized that for PDEs if you manually factor out common expressions , it makes it much easier for maple to solve it.

I was wondering if there were other "tricks" like these that I might be unaware of.

Also I found this link comparing how maple compares to mathematica in solving known PDES just in case the maple developers are interested.
Results (12000.org)

If there is a list of operations that do not work properly in 2D notation, please add the expression sequence operator `$` which does not work with strings as demonstrated in the attached worksheet . sequenceoperastionfailure.mw

It seems to work properly with numeric sequences. I only noticed this in maple 2023, but it likely applies to earlier versions as well

Hi Maple friends,

Im new to Maple and Im struggeling with a problem.

I have the numbers of a bode plot (abs and phase) and I want to fit it in an equivalent circuit.

My problem is: I firstly want to calculate the real and imaginary part of the measured impedance of the bode plot (This works so far after a few hours of trying) and then I want wo calculate the values for each equivalent circuit component. For that I need the values of the impedance calculation to further process them.

The problem is: The impedance calculation returns the values as a list (I think). So Im wondering how can I get the values out of the list? My code so far is attached below.

Thanks in advance!

PS: Im sorry for the layout of the code. Im not sure how I can format the code right.

eq1 := diff(f(x), x, x, x)+(1/2)*cos(alpha)*x*(diff(f(x), x, x))+(1/2)*sin(alpha)*f(x)*(diff(f(x), x, x)) = 0;

eq2 := diff(g(x), x, x)+diff(g(x), x)+(diff(g(x), x))*(diff(h(x), x))+cos(alpha)*x*(diff(g(x), x))+sin(alpha)*f(x)*g(x) = 0;

eq3 := diff(g(x), x, x)+diff(h(x), x, x)+1/2*(cos(alpha)*x+sin(alpha)*f(x)) = 0

ics := f(0) = 0, (D(f))(0) = 1, ((D@@2)(f))(0) = a[1], g(0) = 1, (D(g))(0) = a[2], h(0) = 1, (D(h))(0) = a[3];

I am trying to give an input to an R program from an output the edge set of maple code 

Now how to Build a function which takes a list of edge sets as inputs and returns a list on the below format

Show I want for one edge set of the list

Now I have edge set of a Graph G say {{1,2},{2,3},{3,4},{4,5}}

Now want to pick the first values of each index make one set 

from<-c(1,2,3,4)

Similiarly first values of each index make one more set 

to<-c(2,3,4,5)

Then I want to form a list [from<-c(1,2,3,4),to<-c(2,3,4,5),ft <- cbind(from, to),Graph1<-ftM2graphNEL(ft)]

Now it will take second graph in the Edge list say {{1, 2}, {1, 7}, {2, 3}, {3, 4}, {4, 5}, {5, 6}, {6, 7}}

It will append to the previous list like

[from<-c(1,2,3,4),to<-c(2,3,4,5),ft <- cbind(from, to),Graph1<-ftM2graphNEL(ft),from<-c(1,1,2,3,4,5,6),to<-c(2,7,3,4,5,6,7),ft <- cbind(from, to),Graph2<-ftM2graphNEL(ft)]

This time Graph1 is changed to Graph2 to be observed.

Like that it will need  increase graph number based on the number of edge sets in the list of edges.

To be done all edge sets in list

As then I can copy the entire contents in the list and paste in R so that i can run 

As I can have 100 or more graphs done in maple doing for each of them manually typing may be difficult.

Kind help please

Your help will be surely Acknowledged 

Kind help

A toy code i simply tried for graph attached

But I have errors some come with double quotes can something be done if possible please guide

Kind help

As with 100 of lines it will easy to copy paste 

If the contents of the list can be written to txt file it would be helful 

please help

toy_try.mw

I have tried something to my knoewledge please help

Someone added "Duplicate question" tag on this question.

How is this duplicate question? Where is the duplicate question? 

Is this a bug?

Accoding to this help page 

A derived class must not redeclare (via a local or export declaration) any members inherited from the base class

this example does not do this. But derived class gets an error when using ::static on a method declared in base class and this only shows up when using kernelopts('assertlevel'=2):

So it is either kernelopts('assertlevel'=2): is wrong or help is wrong.  Here is example

Download static_error.mw

Removing the line kernelopts('assertlevel'=2): the error goes away. Also keeping kernelopts('assertlevel'=2): but removing the ::static from the derived class the error goes way.

What is going on?

Maple 2023 on windows 10.

Does anyone know how to remove this boring notation? I would like to know why Maple does not give me "± 2x". Thanks in advance.

I am trying to define a Tensor expression in the physics package but it seems to be taking eons to do so, it has been running for quite some time but still no result to the point where I halt the computation. 

Does anyone have any ideas on how I could accelerate the process? 

I have attached the file I am working with. 

Define.mw

If in a .mw file I have a Document Block with about 10 statements in it, what is a way to split it into two blocks that execute seperately? Currently, hitting enter all statements execute.

("Document Block" is the term that shows up when I hover to the left of the text of interest.)

(I know I can cut and paste the last five statements into a new document block, but it seem that there may be an easier way.)

Thanks and Cheers in advance . . .

There appears to be a bug in Maple 2023.0 (Build ID 1689885)  that does not allow you to access submenus when the window is maximized.  For example, trying to select "Insert --> Execution Group" does not work, nor does any other submenu (the submenu will not display and is not accessible).  The only workaround is to un-maximize the window, select the submenu (for example "Insert --> Execution Group --> Before Cursor"), and then re-maximize the window.  Everything works as it should as long as the window is not maximized.  This is on Microsoft Windows 11 with a 2160p monitor.  Any suggestions on how to fix this are appreciated.

I dont know if this is a well formulated question but if I had a set of PDES that have a constant appearing in them (say alpha), would there be a way to solve for the PDE such that the right had side is not zero but just has higher order order terms (say alpha^3 and higher).

For example consider (the random set of equations)
 

eq1 := alpha*diff(f(t, r), r,r) + diff(g(t, r), t) + alpha*g(t, r) = 0;
           

eq2 := alpha*diff(g(t, r), r) + diff(f(t, r), t,t) + f(t, r) = 0;

Is there a way to solve for the system of pde such that the right hand side is only terms of order alpha^3 and higher?