@C_R 

I got that big expression in separate worksheet now.  But it is huge. I also found it makes Maple hangs in expand() even when using timelimit !

So I will post separate question on that, and you can use that expression there.  But if try to print it, it can hang Maple for you also.

I verified that Maple frontend hang when doing print on it. It should have generated that error message about a large expression over 100000.

Do not know why this does not happen in 2024.1 may be setting has changed. I know I did not change anything myself after the upgrade.

These are the type of problems I deal with all day with Maple. timelimit does not work all the time. Hangs when expressions are large and so on.

Maple has not improved in this area for a decade and more.

@C_R 

The problem was when I was doing 

  print(expr)

where expr has leaf count of 373134, which is very large.

When I commented this line out, the Maple front end hang is now gone.

THis is strange, becuase Maple should have generated that message that expression will be not display because its length is over 100000 or something like this. It could be that in Maple 2024.1 this limit is not active? I do not know.

NOthing special about my graphics card. I have NVIDIA  GEForce RTX 3060. Direct X 12.0 on windows 10.   128 GB RAM.

1 year old new PC. 

So to reproduce this hang, I just need to activate the print again on this large expression. So it should be possible to duplicate this by making very large random mathematical expression/equation and then try to print it in the worksheet and see what happens? 

@Ronan 

 is when quitting Maple it often does not offer the option to save your work. It used too. 

Save your worksheet each time before you run anything. That is what I do. Do not do the auto-save option in the options, THis can cause hangs. Believe me. 

Only way is to just get used to hitting the save bottom as many times as you can and before running any code you have. If you make changes, click save always.

I have to terminate Maple may be 2 dozen times each and every day due to hangs and such. 

I write all my code in .mpl files anyway. I just used the worksheet to test the code I have.

I see these all the time. Not just in Maple 2024.1 but in all other Maple versions. sometimes the front end freezes and do not refresh. And never ever try to copy large data from output in the worksheet. This will definitely cause hangs. Java does not handle this well.

Actually as we are speaking now, I just got the GUI stop responding. Maple 2024.1 on wndows 10. I am running some of my functions, and now the worksheet froze. I cant even close the worksheet, all of Maple hanged. Here is movie

If this is first time you see such issues in Maple, it means you have not been using Maple for long time :)

Only way, was to kill all of Maple (not just mserver.exe).

I miss the old Maple software, before Java infected it.

Update:

This seems to happen when large expressions is being printed on screen.

I am able now to reproduce this all the time when I turn printing on in my program, which causes print() to become active and large stuff is printed on the screen.

It could be flushing to worksheet issue. I do not know.

Since I am now able to reproduce this all the time, this is from task manager showing Maple while the front end is hanging as we speak.  Notice that the memory is not changing on the front end, but CPU is running high all time. This indicate it went into a LOOP somewhere and can't get out of it.

I had to kill Maple again in order to recover from this as not possible to do anything else when this happens.

@C_R 

I think these with _G stuff in them are places holder for when Maple is unable to find specific explicit type.odeadvisor basically says it does not know what type/class this ode is, or it has no concrete name.

Here is an example

ode:=y(x)^2*diff(y(x),x)+3*x^2*y(x)=sin(x);
DEtools:-odeadvisor(ode)

[`y=_G(x,y')`]

And if we try to solve it using dsolve, no solution is returned.

But just because odeadvisor returned type with _G it it, does not always means dsolve can't solve it. It just means there is no other specific type name to give it, so generic one _G is given. Here is another example

ode:=diff(y(x),x) = (2*x+2+x^3*y(x))/(ln(y(x))+2*x-1)*y(x)/(x+1);
DEtools:-odeadvisor(ode)

[`x=_G(y,y')`]

But this one dsolve is able to solve.

dsolve(ode)

So _G is used when there is no designated name for the ode. It is like a place holder. If odeadvisor find specific type name for the ode, it will not also use _G() name for the same ode.

@C_R 

why Maple did not list the type dAlembert. Maybe it is done on purpose to suggest/advise most suitable methods.

My understanding it checks all possible types.  For first order ode, these are given by

[`odeadv/1st_order/class`[0]]

Which gives

[`odeadv/quadrature`, 
`odeadv/separable`, 
`odeadv/linear/A`, 
`odeadv/linear/B`, 
`odeadv/linear/C`, 
`odeadv/linear`, 
`odeadv/homogeneous_A`, 
`odeadv/homogeneous_D`, 
`odeadv/homogeneous_G`, 
`odeadv/homogeneous_C`, 
`odeadv/homogeneous_B`, 
`odeadv/exp_sym`, 
`odeadv/lin_sym`, 
`odeadv/exact`,
 `odeadv/rational`, 
`odeadv/Clairaut`, 
`odeadv/Bernoulli`, 
`odeadv/sym_pat/[F(x),G(y)]`, 
`odeadv/sym_pat/[F(x)*G(y),0]`, 
`odeadv/sym_pat/[F(x),G(x)]`, 
`odeadv/sym_pat/[F(x)+G(y),0]`, 
`odeadv/RiccatiS`, 
`odeadv/Riccati`, 
`odeadv/Abel`, 
`odeadv/Abel2/A`, 
`odeadv/Abel2/B`, 
`odeadv/Abel2/C`, 
`odeadv/dAlembert`, 
`odeadv/Chini`, 
`odeadv/sym_implicit`, 
`odeadv/pot_sym`, 
`odeadv/sym_pat/[F(x),G(x)*y+H(x)]`, 
`odeadv/y=_g(y')`, 
`odeadv/x=_g(y')`, 
`odeadv/0=_G(x,y')`, 
`odeadv/0=_G(y,y')`, 
`odeadv/y=_G(x,y')`, 
`odeadv/x=_G(y,y')`]

The fact that odeadvisor did not say that this ode is dAlembert also means it failed to detect it is? Because it is supposed to check each of the above types one by one and returns the ones that check true.

@C_R 

I cannot match Maples definition

It is dAlembert:

In Maple code

restart;

ode:=diff(y(x), x) = (3*x - y(x) + 1)/(3*y(x) - x + 5);
eval(ode,diff(y(x),x)=_Z);
PDEtools:-Solve(%,y(x));
expand(%);
collect(%,x);
eval(%,_Z=diff(y(x),x))

dAlembert always has singular solutions but the question is, what happens when the singular solution does not satisfy the IC. Should it still be returned? When I go back to school, I have to remeber to ask my ODE teacher on this.  Since singular solution is the envelope of the family of solutions, may be it does not have to. It just needs to satisfy the ode itself only. So Maple could be  correct by returning the singular solution y=x-1 even though it does not satisfy the IC. This is why I asked this question.

If no IC is given, then there is no issue of course.

@Khair Muhammad Saraz 

 i want to edit it is edit able again i  have to restart the file

I assume what you mean by restart the file is that you have to close the worksheet and open it again?

This is strange, Did you by any chance set the editable box off when you run the code? There is a little option at bottom of the worksheet like this:

If you have turned that off somehow, then you can't edit the worksheet any more.

But this is not something that will turn off on its own as far as I know, unless you did that.

Other than this, I do not know why you can't make changes to your worksheet again.

It will help to post version information, OS, and example worksheet. May be someone can figure it out.

It happens on second and all next calls. Not on first call. May be it is a bug.

Download fix_interface.mw

@C_R 

Could you please try with larger timeout to see if it will hang? 30,40,50 seconds? As it depends on the timeout and how fast the PC is. 

@C_R 

Thanks for checking. Does this mean it did hang for you on Maple 2024.0 but not on 2024.1?

I have no access to Maple 2024.1, I thought it was not released yet to try it.  But once it is out officially will upgrade and try for sure.

@Carl Love 

I meant to say implicit. Similar to Maple's solution. will correct now.

any reason integration by parts can not be used to isolate get implicit y solution?

@Joseph Poveromo 

Your ode has invalid syntax, You are using [ ] for grouping terms

May be it is a copy paste issue. I do not know. But you can't use [ ] in place of ( )

Maple 2024 on windows

do you have to use version()? Why not  one of these:

p1:=interface(version):
p2:=kernelopts(version):

They do not print anything on screen. Do not know if these will do what you want but they have the Maple version in there, You'd have to just parse it out which is easily done. on my PC  these give