I rescently downloaded and installed my new Maple 2020 on my Windows 10 64x computer.

I noticed this in the install log:

   Log started 06/13/2020 at 03:25:42
   Preferred installation mode : win32
   Trying to init installer in mode win32
   Mode win32 successfully initialized
   Preparing Check for Update Tool
   Checking for Maple 2020 Updates

My question is this:  I know that under windows 10,  32 bit progams will generally install on even if a computer is 64x.

So should have Maple installed under mode win32?  Is there a 64 bit mode that will take better advanage of the system?

For that matter, is there any configuring that can install it or configure it to take better advanatage of the multi-threaded hardward capabilities?

Thanks, JS

Thank you Edgardo ! :)

Here is what I have :

libname;
"C:\Maths\Maple\lib", "C:\Users\jm\maple\toolbox\GRTensorIII\lib"

Physics:-Version();
The "Physics Updates" version "716" is installed but is not

   active. The active version of Physics is within the library

   C:\Maths\Maple\lib\maple.mla, created 2020, March 5, 2:36 hours

At least it is here. Yesterday I had "Package not installed".

Best.

(still don't know what to do)

I'd like to solve the equation b^4+12*b^2+22*b^2-20*b+1=0

I find   first solution has  common subexpressions 5435 + 3*sqrt(515793), so I want to repalce by t. but unfortunately failed.

why? in  following simple instance, it is OK!

I their any way to use sagemath commands in my maplesoft program that want to use graph theory topological indices which in sagemath but i dont know if in maplesoft or anyone has create a package by any chance

i can see maple in sagemath in this url https://doc.sagemath.org/html/en/reference/interfaces/sage/interfaces/maple.html

but i want other way round sagemath in maple can anyone help as some packages in sage are not in maple i feel

kind help 

Hi,

How to animate 3D figures ? i try insequence but without results

Thanks for ideas

FiguresEspace.mw

I've seen these kind of problems in Maple for many many years now and it is still not fixed with each release.

Occasionally, a call to buildin function hangs in Maple, even with timelimit.

I never once had such a problem using Mathematica. Timeouts always work there. I do not know why it does not work each time in Maple. Must be something to do with the internal design of the kernel. 

The problem also is that I can't even stop it once it hangs using the STOP button in the menu. (when I try this in the GUI, but most of the time I run things as script).

It is actually the server itself which is spining out of control. Task manger in window shows it at full CPU use. When this happens, only way to get out is to terminate Maple from windows task manager. Here is an example

restart;
sol:=1/24*ln(9*x^2*y(x)+2)+1/8*ln(x^2*y(x))-1/24*ln(1+3*(4*x^2*y(x)+1)^(1/2))+1/8*ln((4*x^2*y(x)+1)^(1/2)+1)-1/8*ln((4*x^2*y(x)+1)^(1/2)-1)+1/24*ln(3*(4*x^2*y(x)+1)^(1/2)-1)-1/2*ln(x)-C[1] = 0;
ode:=x^3*diff(y(x),x)^2-(1+2*x^2*y(x))*diff(y(x),x)+x*y(x)^2 = 0;
timelimit(120,odetest(sol,ode))

Sometimes, it does not hang. But next time it could hang. If you try the above and it does not hang, please try to increase the time out to say 3 minutes, it could hang then.

If the timelimit is small, there is good chance it will not hang.

The longer the timeout is, the more likely it will hang.  This does not happn all the time, but on random cases like the above.

This is one of the worst problems I face when using Maple. I never know if a script will run to completion or not when I start it, since it could hang any time. 

I asked about this before.

I am now hoping to see if there is any new insight into this problem and any workarounds.

Maple 2020.1 on windows 10 with lots of RAM. 

I try an import of csv external data file but i have "inconsistency".

With the smaller file import is OK,

With the second, bigger, the import is not "consistency" and i can not after perform statisyical analysis, possible on the smaller.

Attached zipped the 2 files (smaller test1_plantdata, bigger sub1_plantdata)

The structure of the csv file is exactly the same.

follow Maple code (changing directory and file name):

-------------------------------------------

restart;

with(Statistics);

interface(displayprecision = 4);

plantdata := Import("D:/Dati/Prove/Maple/test1_plantdata.csv");

---------------------------

I don't understand where is the "error"...

Thanks, regards.

Whenever I call solve, I now make sure to convert the solution to a set first to get rid of duplicate solutions which could be generated.

Is there a way to tell solve to return unique solution only by default?

restart:
expr:=-1/2*ln(u)-1/4*ln(u^2+2)-ln(x)-C[1]:
sol:=solve(expr = 0,u):
nops([sol])

   8

But there are actually only 4. The other 4 are duplicated

nops(convert([sol],set))

 4

This does not happen all the time,but I noticed it few times now. Is this to be expected?

Maple 2020.1

 I try to solve the general solutions of  sin(x^2)=1/2. And then I would  like to check the solution,but failed. How to do?

it sholud be 1/2. Thanks!

I gave odetest some confusing long candidate solution to check for me. It gave an internal error

restart;
ode:=3*y(x)*cos(x)+4*x*exp(x)+2*x^3*y(x)+(3*sin(x)+3)*diff(y(x),x) = 0:
sol:=y(x) = -1/3/(exp(I*x)+I)^2*exp(((24*I*x*exp(I*x)-24*x)*polylog(2,I*exp(I*x))+(-24*I-24*exp(I*x))*polylog(3,I*exp(I*x))+(4*I*x^3-3*I*x+6*I*Re(x)-6*Im(x))*exp(I*x)-6*I*Im(x)+3*x-6*Re(x))/(3*exp(I*x)+3*I))*(1-I*exp(I*x))^(-4*x^2)*(4*int((1-I*exp(I*x))^(4*x^2)*x*(2*I*exp(((-24*I*x*exp(I*x)+24*x)*polylog(2,I*exp(I*x))+(24*I+24*exp(I*x))*polylog(3,I*exp(I*x))+(6*Im(x)-6*I*Re(x)-4*I*x^3+(3+6*I)*x)*exp(I*x)+6*I*Im(x)+6*Re(x)+(-6+3*I)*x)/(3*exp(I*x)+3*I))+exp(((-24*I*x*exp(I*x)+24*x)*polylog(2,I*exp(I*x))+(24*I+24*exp(I*x))*polylog(3,I*exp(I*x))+(6*Im(x)-6*I*Re(x)-4*I*x^3+(3+9*I)*x)*exp(I*x)+6*I*Im(x)+6*Re(x)+(-9+3*I)*x)/(3*exp(I*x)+3*I))-exp(((-24*I*x*exp(I*x)+24*x)*polylog(2,I*exp(I*x))+(24*I+24*exp(I*x))*polylog(3,I*exp(I*x))+(6*Im(x)-6*I*Re(x)-4*I*x^3+(3+3*I)*x)*exp(I*x)+6*I*Im(x)+6*Re(x)+(-3+3*I)*x)/(3*exp(I*x)+3*I)))/(sin(x)+1),x)-3*C[1]):

timelimit(30,odetest(sol,ode));

Error, (in tools/map) too many levels of recursion

I agree that the solution I gave it is very long and most likely is wrong solution. But that is besides the point. The problem with these internal recursion errors, is that try/catch does not catch them. So the whole program stops, and not able by bypass this error.

Should odetest have handled this better?

fyi, I posted similar internal error from Maple about 2 weeks ago in https://www.mapleprimes.com/questions/229872-Error-in-Discontzero-Too-Many-Levels

due to too many levels of recursion as well, but that was fromt rying to evaluate int. 

Maple 2020.1 , Physics 708

Hello each and everyone,

I have a problem with *my* machine (I suppose) :

Physics:-Version();
The "Physics Updates" version "716" is installed but is not

   active. The active version of Physics is within the library

   C:\Maths\Maple\lib\maple.mla, created 2020, March 5, 2:36 hours

It was the same for version 715.

What do I have to do to make it "active". I never had this problem.

Thank you.

Maple 2020.1 , Windows 10 Pro 2004

Hello All, 

Would please tell me how to get the result from 'arctan()' function by using a part of the results from 'solve' command?

Here is an example:

What would be the way to rectify the error above?

Download Qprime20200701.mw

why does Maple say that timelimit got one argument when doing

timelimit(30,solve(x^2+a=0,x) assuming a>0)

There is clearly 2 arguments in the above, The first is 30 and the second argument is solve(x^2+a=0,x) assuming a>0

I know the workaround is to add [ ] around solve(). 

timelimit(30, [solve(x^2+a=0,x) assuming a>0])

Maple 2020.1 windows

My problem is: factoring G from c4s1 results in different value in c4s2. Why?

wfn := 12; win := 5; wun := 90; zd := .8; xd := 80; xfd := -500; xid := 12; x0d := 66; lamf := 11; lamu := 44; lami := .99; G := 6.7777; kxui := 10; kxif := 33; 
cg3 := evalf(-kxui*cos(wun*zd)*exp(lamu*(xid-x0d))*(exp(-2*lamf*xfd)*(kxif*lami-lamf)+kxif*lami+lamf)/(2*cos(win*zd)*(cosh(lami*xid)*(kxif*kxui*lami*lamu*(1+exp(-2*lamf*xfd))+lamf*lami*(1-exp(-2*lamf*xfd)))+sinh(lami*xid)*(kxif*lami^2*(1+exp(-2*lamf*xfd))+kxui*lamf*lamu*(1-exp(-2*lamf*xfd))))));
c4s1 := evalf(   exp(lami*xid)*cos(win*zd)*exp(lamu*x0d)*cg3*G*kxui*lamu+exp(lami*xid)*cos(win*zd)*exp(lamu*x0d)*cg3*G*lami+G*kxui*cos(wun*zd)*exp(lamu*xid)); 
c4s2 := evalf(G*(exp(lami*xid)*cos(win*zd)*exp(lamu*x0d)*cg3  *kxui*lamu+exp(lami*xid)*cos(win*zd)*exp(lamu*x0d)*cg3  *lami+  kxui*cos(wun*zd)*exp(lamu*xid)));
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