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Question: solve identity, assertion failed, division by zero problem.

Question:solve identity, assertion failed, division by zero problem.

nm 10099 Maple 2024
solve division-by-zero error
August 23 2024
2

Can solve give internal Maple error of division by zero to the caller?

Also when I run this using kernelopts('assertlevel'=1): or kernelopts('assertlevel'=2):, then not able to catch the internal error any more, which is division by zero using try/catch.

Only when kernelopts('assertlevel'=0).  can try/catch trap the error.

This means now I have to set kernelopts('assertlevel'=0) before calling solve to be able to trap the error and set it back to kernelopts('assertlevel'=2) after that, else the whole program halts.

But my main question is: can solve throw internal error of division by zero? I mean, is this expected sometimes to happen? I would have thought Maple should internally catch this and simply return no solution if can't solve it.

This equation is auto generated and the program calling solve on it to see if it can solve it.

Here is the worksheet

> 

interface(version);

`Standard Worksheet Interface, Maple 2024.1, Windows 10, June 25 2024 Build ID 1835466`

> 

Physics:-Version()

`The "Physics Updates" version in the MapleCloud is 1792 and is the same as the version installed in this computer, created 2024, August 22, 12:6 hours Pacific Time.`

> 

libname;

"C:\Users\Owner\maple\toolbox\2024\Physics Updates\lib", "C:\Program Files\Maple 2024\lib"

> 

eq:=1 = 1/((exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*X + exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*x0 + 2*Y + 2*y0)^2*Y*(exp(X*Y)^2*exp(X*y0)^2*exp(x0*Y)^2*exp(x0*y0)^2*X + exp(X*Y)^2*exp(X*y0)^2*exp(x0*Y)^2*exp(x0*y0)^2*x0 + 2*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*X*Y^2 + 4*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*X*Y*y0 + 2*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*X*y0^2 + 2*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*Y^2*x0 + 4*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*Y*x0*y0 + 2*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0)*x0*y0^2 - X^2*exp(X*Y)*exp(X*y0)*exp(x0*Y)*exp(x0*y0) - 2*exp(X*Y)*exp(X*y0)*x0*exp(x0*Y)*exp(x0*y0)*X - exp(X*Y)*exp(X*y0)*x0^2*exp(x0*Y)*exp(x0*y0) - 2)):
> 

kernelopts('assertlevel'=2):
try
   solve(identity(eq,X),[x0, y0]);
catch:
   print(lastexception);
end try;

Error, (in unknown) assertion failed

> 

kernelopts('assertlevel'=1):
> 

try
   solve(identity(eq,X),[x0, y0]);
catch:
   print(lastexception);;
end try;

Error, (in unknown) assertion failed

> 

kernelopts('assertlevel'=0):
> 

try
   solve(identity(eq,X),[x0, y0]);
catch:
   print(lastexception);
end try;

unknown, "numeric exception: division by zero"

> 

 


 

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