I wanted to keep a running total over a number of independent batch mode Maple scripts.

So I figured I use .m file.   

Each run will read the old variable from .m file, update it, and write it again.

All what it need to do is just check if the .m file exist or not to account for the very first run.

But to my surprise, I found the variable content do not update after doing SAVE A,"TMP.m"

It seems Maple sees A variable already in TMP.m and does not save the new value of A again?. Just guessing. I was expecting that after I do  read "TMP.m" that the variable in the file will overwrite same variable value in the local proc. 

After one time update, each time I read the variable, its value is same.

First time using save myself, so may be I am doing something wrong but do not see it. I was expecting to see   10,20,30,40,50,..... running total, but I see 10,20,20,20,20,...../

What Am I doing wrong? do I need to make the variable global for this to work?

Here is worksheet. Maple 2024 on windows 10.

Download T.mw

Just found very serious problem.

Was trying my code in command line maple (cmaple.exe) only to find latex() command fails now.

Same code works with no problem in worksheet.  Here is first the worksheet version.
 

Download worksheet_version_latex_OK_june_21_2024.mw

Now I do same thing but from command line. I put the above code in A.mpl file in some folder on windows:

ode:=diff(y(x),x)=x;
try
    s:=latex(ode,'output'=string):
    print("Latex command worked on ode");
catch:
    error lastexception;
end try:


the_output:=Student:-ODEs:-ODESteps(ode,y(x)):
try
    s:=latex(the_output,'output'=string):
    print("Latex command worked");
catch:
    error lastexception;
end try:

Then opened a command windows terminal and cd to the above folder and typed this command

"C:\Program Files\Maple 2024\bin.X86_64_WINDOWS\cmaple.exe"  -q A.mpl

And this is what happens. Latex works OK on generating latex for the ode, but not for the steps!It gives error

Error, latex, invalid input: %1 uses a %-2 argument, %3 (of type %4), which is missing, latex:-ModuleApply, 1, e, anything

Also I was not able to suppress the display of the odesteps on the terminal even though they do not display in worksheet, they still print in the terminal. But this is a side issue.

Why does Latex gives error in command line? 

I think it is related to those funny looking characters (bullets?) signs at the start of each ODE step that show in the terminal? 

But in worksheet latex has no problem converting the ODE steps to Latex. It is only in cmaple. 

Is there a way to correct this? It seems to be some character encoding is causing the problem for Latex on command line vs. worksheet.

Windows 10, Maple 2024

How did Student:-ODEs:-ODESteps([ode,ic]); managed to get this zero solution to this ode? I can't follow the logic it did.

Any ideas what it is doing in the 4th step there?
 

Download strange_ode_steps_solution_june_20_2024.mw

I am getting Maple server crash each time running this solve command.

Could others reproduce it? I am using windows 10. Maple 2024.  Why does it happen?

Will report it to Maplesoft in case it is not known. Worksheet below.

Download maple_crash_calling_solve_june_18_2024.mw

This bug seems to have been introduced in Maple 2023 since it crashes there also.

But not in Maple 2022. No crash there. Same PC.

Download maple_NO_crash_calling_solve_june_18_maple_2022.mw

odeadvisor says that this ode is _homogeneous, `class A`, but I am not able to verify this. Also when asking dsolve to solve it as 'homogeneous' it returns no solution. 

This type is described in https://www.maplesoft.com/support/help/maple/view.aspx?path=odeadvisor%2fhomogeneous

Here is worksheet with my tries.

Would someone be able to confirm if this is really an _homogeneous, `class A` ?

my own code checking says no.  But if it is, then why dsolve do not solve it when asking it to use homogeneous method? Is the method I asked it to use it do not apply to class A?

Download checking_homogo_ode_type_june_18_2024.mw