I have found few PDE's so far  that timeout in Maple 2021 which did not do that in Maple 2020.2. Using same amount of time out, on same PC.

After some debugging, I found that that cause is calling latex:-Settings(....) before calling  timelimit(pdsolve(...))  causes the timeout.

At first, I thought this must be coincidence. Why would calling latex make pdsolve timeout?

So I tried again and again and again. Each time, removing the call to latex makes pdsolve not time out. Putting latex call back in, now pdsolve times out. Each time restart is always called (in new cell) before.

The timeout is 10 minutes.  Without latex called before, pdsolve took about about 5 minutes on my PC to solve the PDE.  

Any one could see if they can reproduce this?

Why would calling latex:-Settings(....)  causes pdsolve now use all 10 minutes and then timeout? This is very strange.

Maple 2021. Latex Physics package. Windows 10.

attached is worksheet showing this with many tries.

restart;
latex:-Settings(UseImaginaryUnit=i,
      UseColor = false,
      powersoftrigonometricfunctions= mixed, ## computernotation,
      leavespaceafterfunctionname = true,
      cacheresults = false,
      spaceaftersqrt = true  
);

pde :=  a*ln(lambda*x)^n*diff(w(x,y),x)+ b*ln(mu*x)^m*diff(w(x,y),y) = c*ln(nu*x)^k*w(x,y)+p*ln(beta*y)^s+q;
timelimit(60*10,pdsolve(pde,w(x,y)));

#Error, (in expand) time expired
#OR 
#Error, (in evala/Divide/heuristic) time expired


restart;
pde :=  a*ln(lambda*x)^n*diff(w(x,y),x)+ b*ln(mu*x)^m*diff(w(x,y),y) = c*ln(nu*x)^k*w(x,y)+p*ln(beta*y)^s+q;
timelimit(60*10,pdsolve(pde,w(x,y)));

#no problem solution found.

why_time_out_with_latex_march_23_2021.mw

When inside a section, why typing a command or any Maple expression, makes the cursor jump to outside the section after that?

Is it possible to create a new cell (i.e. >) and jump to that, so to remain inside the section?

Currently, I have to do CTRL-J to make new exection group, i.e. >, below the current one and remain inside the section, which is too much work. 

This is using worksheet mode. I see an option in tools->options->display to do that automatically. Which is great. But it does not work inside a SECTION. 

This is how to reproduce

1. set  tools->options->display->always insert new execution group after executing

2. In worksheet, click on insert->section to make new section.

3. in the first cell inside the section, type any Maple command or statement. Now you will see the cursor jumps outside the section, and makes new exection group (i.e. >).  But my cursor is now outside the section. So I have to move it back to inside the section.

I want to remain inside the section and have ">" be created inside the section.

Is this possible?

Maple 2021, windows. Worksheet mode.

I will make small movie to illustrate.

sometimes when I see such things, I get the feeling that the folks who develop the interface at Maplesoft, do not use it too much themselves. Else they would have noticed this annoyance in using sections. 

When inside a section, one would expect that a new exection cell to be created inside the section itself and not outside. 

Comparing the following 2 outputs, all done using worksheet mode. They are same expression. But one is generated using assignment and one using function definition (with arrow).

restart;
expr:=sinh(Pi)/Pi*(1+  Sum( (-1)^n/(1+n^2)*(cos(n*x)+n*sin(n*x)),n=1..m)):
f1:=expr;
f2:=unapply(expr,x);

Why Maple 2D display shows small dot for multiplication in the second case, but not in the first? Is there a way to remove this dot? I do not like it and find it distracting.  I looked at options->display and see nothing there to affect this.

Maple 2021 on windows 10

When I installed Maple 2021 student version (did an upgrade from Maple 2020 to get discount price). I noticed that Maple 2021 only has "shared server" icon to click on to start Maple GUI.

I do not know what the difference between "shared server" and the icon without it.

In Maple 2020, it shows both "maple 2020" and "shared server maple 2020". And when using 2020, I always clicked on "maple 2020", not the "shared server maple 2020".  This is standalone personal PC used only by me.

But in Maple 2021, only "shared server Maple 2021" shows up. And so this is the one I now use, and Maple comes up OK.

But why Maple 2021 do not have an icon without "shared server" on it like 2020?  Is this something I should worry about?

Here is screen shot from my START menu on windows 10 showing the difference. 

In Maple, when calling LinearAlgebra:-Eigenvectors the order can change randomally each time. Ofcourse the result is always correct, but can show up in different order. 

I find this confusing, as I am looking at the screen, and see order changed each time. This is the order of how Maple shows the eigenvalues and corresponding eigenvectors.

Why does Maple do this? Is there a way to have same order given each time? Here is an example. If you run this code twice, most likely you will get different order each time. If not, try the command one more time.

restart;
Sy:=1/sqrt(2)*Matrix([[0,-I,0],[I,0,-I],[0,I,0]]);
lambda, v :=LinearAlgebra:-Eigenvectors(Sy);

screen shot

I thought there might be a global option to tell Maple not to do this? 

Again, answer is correct each time. I just like same output to show each time, as it is less confusing. Sometimes I think I did something wrong when I see different output show up for same command.