Unfortunately, I can't solve the problem in MAPLE that appears in the last line of the picture (0=1 instead of a₀=1) unless I write a₀ seperately and add the partial sum starting from k=1 to it.

I assume the problem is with 0⁰ in the power series but since MAPLE defines 0⁰:=1 I'm not sure about it. Anyone knows a better solution or can tell me if I made a mistake somewhere?

This worksheet plots the non-overlapped images of two spheres, but plotted procedure p fails to successfully pass the choice of color to the implicitplot3d command.

How can this be accompished?

Sphere_exclusions.mw

Hi there.

I noticed that in Maple 2020 default font size of document (Times New Roman 12) looking bigger than in previous versions. How can I make the view the same as in previous versions?

Thank you

Hi there.

How supress this warning in Maple 2020 when I use "e" just like a variable not an exponent:

Warning, if e is meant to be the exponential e, use command/symbol completion or palettes to enter this special symbol, or use the exp function

?

Thank you

Recently Maple started freezing on me for a few minutes; after that it continues to work and then freezes again and so on (it does not so much freezes as it pauses).  I do not know what changed on my system (which is Windows 10) for this to happen.  I had been using Maple 2019 when this started and then upgraded to Maple 2020 but that did not solve my problem.

It does not seem to have to do with the type of computations I am doing.

I have problem with usage of solve for the solution of the system of six and eight symbolic equations. I need to get expressions for variables: R__xl, R__xs, R__xsi, R__zl, R__zs, R__zsi, dbeta__l(t), dbeta__s(t). I tried to find solution for 8 equations, but I got the message: Warning, solutions may have been lost. I thought that the system is non-linear and tried to solve it for six variables (R__xl, R__xs, R__zl, R__zs, R__zsi, R__xsi), in this case equations are linear, but Maple ignored the solve command and did not give a solution or error. Could someone help me with this problem?

Quasi-static.mw

Hello

I am not sure how to choose between Threads:-Seq and Grid:-Seq.  

The problem:  a procedure, proc1, that calls two other procedures, proc2 and proc3, verifies if a set of parameters fulfills a certain condition. Proc1, proc2 and proc3 are not part of Maple available functions.  

Right now I am using Grid:-Seq to return the result of applying proc1 to chunks of a thousand parameters.  I wonder whether I could use Thread:-Seq instead.   What are the advantages of using one instead of the other?  And when do I choose one over the other?  

I would appreciate if you could provide simple examples to explain the differences.  

Many thanks.

Ed

PS.  There is a problem with Grid:-Seq as reported in one of my previous questions.

I have load the new Physics-Version 678, but it is not active. How can I do this?

Here the output:

                            restart

                           version()

 User Interface: 1455132
         Kernel: 1455132
        Library: 1455132
       MapleIDE: 928330

                            1455132

                      interface(version)

Standard Worksheet Interface, Maple 2020.0, Windows 10, March 4

   2020 Build ID 1455132

                      kernelopts(version)

   Maple 2020.0, X86 64 WINDOWS, Mar 4 2020, Build ID 1455132

                       Physics:-Version()

The "Physics Updates" version in the MapleCloud is 678 and is

   the same as the version installed in this computer, created

   2020, May 20, 10:21 hours, found in the directory

   C:\Users\wgellien\maple\toolbox\Physics Updates\lib\

                            restart

                     Physics:-Version(678)

Warning, this package updates content shipped in a standard Maple install.  Use the 'restart' command to clear your session before using these commands.
Kernel(The "Physics Updates" version "678" is installed but is

   not active. The active version of Physics is within the

   library C:\Users\wgellien\maple\toolbox/Physics Updates/lib\P\

  hysics Updates.maple, created 2020, May 20, 14:46 hours),

  [The "Physics Updates" version "678" is installed but is not

   active. The active version of Physics is within the library

   C:\Users\wgellien\maple\toolbox/Physics Updates/lib\Physics

   Updates.maple, created 2020, May 20, 14:46 hours]

With kind regards

Wolfgang Gellien

Beware!

In Maple 2019 we get the strange value

cos((Pi/2) -1e-12);
                                                  -10
                       -2.051033808 10   

In Maple 2020 we get the correct answer

cos(Pi/2-1e-12);
                                                                      -13
                9.999999999996916397514419 10   

That error in Maple 2019 certainly messed up quite a few of my calcualtions!

Before Maple 2020, it was possible to start up Maple from the Linux commandline with multiple files, as  in

maple   -x   worksheet-1.mw   worksheet-2.mw   ...   worksheet-n.mw

That started up Maple's Java interface and loaded the n worksheets in separate tabs.

That no longer seems to work in Maple 2020 — now the command exits silently when invoked with multuple files.  Why?

Aside: Loading a single file works as expected, but not multiple files.

Hi, I'm on Maple 2020 on Mac, and running this:

" />

In fact, that isn't the Chromatic number of that graph. Is not possible to color that graph with 2 colors becuase C7 (Cycle with 7 vertex) is a subgraph which is imposible to color with 2 colors. Am I doing something wrong? Can you replicate this? Is this a bug or is me?

Thanks

Maple formerly accepted

rule1 := forall(string(y), TD(y) = D(y)):

but now that statement prodices an error message:

Error, (in forall) expecting bound variable(s) to be a name or list of unique names

The entire value of this forall structure is that it should apply to objects of specific types, but it is not obvious how to express those types; the Help page for 'forall' is essentially useless in relation to this question. 

Any help why this code fail

restart;
PDE := diff(u(x,y), y$2 ) + diff(u(x,y), x$2) = 0;
BC:= u(x,0)=0, u(x,100)=100, u(0,y)=0, u(10,y)=0;
sol:=pdsolve([PDE,BC],numeric);

gives

Error, (in pdsolve/numeric/process_PDEs) PDEs can only contain dependent variables with direct dependence on the independent variables of the problem, got {u(0, y), u(10, y), u(x, 0), u(x, 100)}
 

But sol:=pdsolve([PDE,BC])  works OK and gives analytical solution.

What error Am I doing in the above code in this case?

Maple 2020 with Physics 642

I'd like to find chromatic number of some graphs. But I find a strange thing of function ChromaticNumber. 

It is Ok!

But when I use following codes, an error will be issued.

I try to take a partial derivative of compound expressions. Usage of diff, Diff, substitution variables instead of time-variant variables (subs) couldn't help me.

Download DiffExpr.mw

Should I use implicitdiff? If yes, how does it work?

Also, I don't understand, why the derivative of theta_l is displayed so strange, as if the derivative is taken from the index l?

P.S. This question is a continuation of my last topic: https://www.mapleprimes.com/questions/229551-Operations-On-Several-Defined-Functions