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First timelimit hang discovered in Maple 2022...

Asked by: nm 9934
int timelimit
March 18 2022
4  0

I knew it can't be true that timelimit in Maple 2022 no longer hangs and it is only a matter of time before I find a case where it still hangs.

Here are examples. timelimit hangs. No error or anything, it just hangs. timelimit is just ignored. set the limit to 60 seconds  (CPU time), and waited for 20 minutes (real time) and nothing happend.

I hope in Maple 2023 this will be fixed. Could others confirm this? it only hangs when adding the method=_RETURNVERBOSE otherwise it does not hang.

> 

interface(version);

`Standard Worksheet Interface, Maple 2022.0, Windows 10, March 8 2022 Build ID 1599809`

Examples of timelimit hangs in Maple 2022

 

Example 1

> 

restart;

> 

integrand:=(B*x+A)/(c*x^2+b*x+a)^2/(f*x^2+e*x+d)

> 

try
  timelimit(60,int(integrand,x,method=_RETURNVERBOSE));
catch:
  print("Timed out");
end try;

> 

 

Example 2

> 

restart

> 

integrand:=(5*x^4-x^3+3*x^2+x+2)*(2*x^2-x+3)^(1/2)/(5+2*x)^3

> 

try
    timelimit(60,int(integrand,x,method = _RETURNVERBOSE));
catch:
  print("Timed out");
end try;

> 

 

> 

 

Download int_hangs.mw

Maple 2022 resets to "share one engine among all d...

Asked by: nm 9934
March 18 2022
2  6

This is a serious problem.

I change "how should maple handle the creation of new math engine?" to "Create new engine for each document". Then click on "Apply globally".  This is under Tools->Options->General

After I close Maple and start it again, I found it back to "Share one engine among all documents" ??

Why is that and how to make this permanent? 

Btw, the start Maple 2022 icon still says "Maple 2022 shared server". THis is in the start program menu. I complained about this in Maple 2021 but it is still not fixed.  https://www.mapleprimes.com/questions/231901-Why-Maple-2021-Only-Shows-shared-Server

I do not think this has anything to do with it. But who knows.

I noticed this when I started new worksheet and could not do anything in it because another worksheet was running something even though I made sure I had set the engine to start new one for each worksheet (this is the very first thing I do after I install Maple each time).

Any workaround to make the setting for the engine not change after closing Maple?

Windows 10. Maple 2022.

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