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Collection of Maple bugs....

nm 11398 Maple 2025
solve assuming differential-equations
September 08 2025
1 0

These are current collections of Maple bugs before I lose track of them. I put them all in one post. Hopefully these can be fixed in Maple 2025.2. For each problem, I post separate worksheet, so there are few worksheets here.

This is all on Linux using 2025.1 and latest SupportTools and latest Physics.

1. Random crashes. This one is very strange. The crash happens randomly. You might need to try few times to see it or close the worksheet and reopen it.
 

> 

restart;

Example . RANDOM CRASHES

 
> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC],y(t)) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

[(5/2)*2^(1/2)*(-(1-sin(2*t)*sin(8)-cos(2*t)*cos(8))^(1/2)*(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2)-sin(2*t)*cos(8)+sin(8)*cos(2*t))/(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2), -10]

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC],y(t)) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

Error, (in anonymous procedure called from cos) too many levels of recursion

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC]) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

[-(5/2)*2^(1/2)*((1-sin(2*t)*sin(8)-cos(2*t)*cos(8))^(1/2)*(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2)-sin(8)*cos(2*t)+sin(2*t)*cos(8))/(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2), -10]

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC]) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

[-(5/2)*2^(1/2)*((1-sin(2*t)*sin(8)-cos(2*t)*cos(8))^(1/2)*(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2)-sin(8)*cos(2*t)+sin(2*t)*cos(8))/(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2), -10]

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC]) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

Error, (in signum) too many levels of recursion

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC],y(t)) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

Error, (in anonymous procedure called from cos) too many levels of recursion

> 

restart

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC],y(t)) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

[(5/2)*2^(1/2)*(-(1-sin(2*t)*sin(8)-cos(2*t)*cos(8))^(1/2)*(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2)+sin(8)*cos(2*t)-sin(2*t)*cos(8))/(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2), -10]

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC],y(t)) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

[-(5/2)*2^(1/2)*((1-sin(2*t)*sin(8)-cos(2*t)*cos(8))^(1/2)*(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2)+sin(2*t)*cos(8)-sin(8)*cos(2*t))/(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2), -10]

> 

restart;

> 

sol:=y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2);
ode:=diff(y(t),t) = (25-y(t)^2)^(1/2);
IC:=y(4)=-5;
odetest(sol,[ode,IC]) assuming t>1;

y(t) = (-25*sin(t+arctan(sin(4)*cos(4)/(sin(4)^2-1)))^2+25)^(1/2)

diff(y(t), t) = (25-y(t)^2)^(1/2)

y(4) = -5

[-(5/2)*2^(1/2)*((1-sin(2*t)*sin(8)-cos(2*t)*cos(8))^(1/2)*(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2)+sin(2*t)*cos(8)-sin(8)*cos(2*t))/(1+sin(2*t)*sin(8)+cos(2*t)*cos(8))^(1/2), -10]

> 

 

> 

 

> 

 

 

Download random_crashes_sept_8_2025.mw

 

2. collection of bugs from solve(identity) (another one related to solve(identity at end)

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

SupportTools:-Version();

`The Customer Support Updates version in the MapleCloud is 29 and is the same as the version installed in this computer, created June 23, 2025, 10:25 hours Eastern Time.`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1877 and is the same as the version installed in this computer, created 2025, July 11, 19:24 hours Pacific Time.`

> 

 

Example 1

 
> 

restart;

> 

eq:=1/8*A^2*exp(2*theta*(B+I))+1/8*exp(2*theta*(B-I))*A^2-1/4*A^2*exp(2*B*theta)-1/4*exp(theta*(B-2*I))*A*B-1/4*exp(theta*(B+2*I))*A*B+1/2*A*B*exp(B*theta)+1/4*exp(theta*(B-2*I))*A*C+1/4*exp(theta*(B+2*I))*A*C-1/2*A*C*exp(B*theta)-1/4*I*exp(theta*(B-2*I))*A+1/4*I*exp(theta*(B+2*I))*A+1/4*C^2*cos(2*theta)-1/4*C^2-1/2*C*sin(2*theta)-1/2*cos(2*theta)-1=0:
the_vars:=[A, B, C]:
solve(identity(eq,theta),the_vars);

Error, (in gcd/doit) too many levels of recursion

> 

 

Example 2

 
> 

restart;

> 

eq:=-x^(1/2)-1/2*x*A^2+A*B*sinh(B*x)-1/2*x*A^2*cosh(2*B*x)=0;
the_vars:=[A, B]:
solve(identity(eq,x),the_vars);

-x^(1/2)-(1/2)*x*A^2+A*B*sinh(B*x)-(1/2)*x*A^2*cosh(2*B*x) = 0

Error, (in gcd/doit) too many levels of recursion

> 

 

> 

 

Example 3

 
> 

restart;

> 

eq:=1 = X*(2*cos(X)*cos(x0)-X*sin(X)*cos(x0)-2*sin(X)*sin(x0)-X*cos(X)*sin(x0)-x0*sin(X)*cos(x0)-x0*cos(X)*sin(x0))*(2*Y*ln(Y+y0)+Y+2*y0*ln(Y+y0)+y0)/Y/(X*cos(X)*cos(x0)-X*sin(X)*sin(x0)+x0*cos(X)*cos(x0)-x0*sin(X)*sin(x0)+sin(X)*cos(x0)+cos(X)*sin(x0))/(2*ln(Y+y0)+2*Y/(Y+y0)+1+2*y0/(Y+y0));

1 = X*(2*cos(X)*cos(x0)-X*sin(X)*cos(x0)-2*sin(X)*sin(x0)-X*cos(X)*sin(x0)-x0*sin(X)*cos(x0)-x0*cos(X)*sin(x0))*(2*Y*ln(Y+y0)+Y+2*y0*ln(Y+y0)+y0)/(Y*(X*cos(X)*cos(x0)-X*sin(X)*sin(x0)+x0*cos(X)*cos(x0)-x0*sin(X)*sin(x0)+sin(X)*cos(x0)+cos(X)*sin(x0))*(2*ln(Y+y0)+2*Y/(Y+y0)+1+2*y0/(Y+y0)))

> 

solve(identity(eq,X),[x0,y0]);

Error, (in signature) too many levels of recursion

> 

solve(identity(eq,X),[x0,y0,Y]);

Error, (in signature) too many levels of recursion

> 

 

> 

 


 

Download collection_of_maple_internal_errors_sept_6_2025.mw

 

3. Adding Physics:-Setup(assumingusesAssume = true): make combine fail

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

SupportTools:-Version();

`The Customer Support Updates version in the MapleCloud is 29 and is the same as the version installed in this computer, created June 23, 2025, 10:25 hours Eastern Time.`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1877 and is the same as the version installed in this computer, created 2025, July 11, 19:24 hours Pacific Time.`

> 

restart
> 

Physics:-Setup(assumingusesAssume = true):
> 

A:=1/6*ln(u^2+1)+1/3*arctan(u)+1/6*ln(u^2-3^(1/2)*u+1)-1/3*arctan(2*u-3^(1/2))+1/6*ln(u^2+3^(1/2)*u+1)-1/3*arctan(2*u+3^(1/2));
combine(A,ln) assuming real;

(1/6)*ln(u^2+1)+(1/3)*arctan(u)+(1/6)*ln(u^2-3^(1/2)*u+1)-(1/3)*arctan(2*u-3^(1/2))+(1/6)*ln(u^2+3^(1/2)*u+1)-(1/3)*arctan(2*u+3^(1/2))

Error, (in assuming) when calling 'is'. Received: 'invalid input: (u^2+1)^(1/6)*(u^2-3^(1/2)*u+1)^(1/6) <> 0'

> 

Physics:-Setup(assumingusesAssume = false):
> 

combine(A,ln) assuming real;

ln((u^2+1)^(1/6)*(u^2-3^(1/2)*u+1)^(1/6))+ln((u^2+3^(1/2)*u+1)^(1/6))+(1/3)*arctan(u)-(1/3)*arctan(2*u-3^(1/2))-(1/3)*arctan(2*u+3^(1/2))

> 

 


 

Download adding_Phsyics_makes_combine_fail_sept_6_2025.mw

 

4. odetest internal error when adding assuming

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

SupportTools:-Version();

`The Customer Support Updates version in the MapleCloud is 29 and is the same as the version installed in this computer, created June 23, 2025, 10:25 hours Eastern Time.`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1877 and is the same as the version installed in this computer, created 2025, July 11, 19:24 hours Pacific Time.`

> 

restart;
> 

sol:=y(x) = 6*x/(3*x-2*LambertW(-3/2*exp(5/2*x+5/6*_C2)))+1/2*x+1/3;
ode:=x-2*y(x)-1+(3*x-6*y(x)+2)*diff(y(x),x) = 0;
odetest(sol,ode,y(x)) assuming positive;

y(x) = 6*x/(3*x-2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*_C2)))+(1/2)*x+1/3

x-2*y(x)-1+(3*x-6*y(x)+2)*(diff(y(x), x)) = 0

Error, (in depends) too many levels of recursion

> 

odetest(sol,ode,y(x)); #removing positive it now works

-(40/3)*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))^4/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))+180*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))^3*x/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))-450*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))^2*x^2/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))+315*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))*x^3/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))-(40/3)*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))^3/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))-252*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))^2*x/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))+630*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))*x^2/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))+315*x^3/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))-432*x*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))/((-3*x+2*LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2)))^3*(1+LambertW(-(3/2)*exp((5/2)*x+(5/6)*c__2))))

> 

 


 

Download internal_odetest_error_sept_6_2025.mw

 

5. solve(identity,..  gives internal error when one variable is missing

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

SupportTools:-Version();

`The Customer Support Updates version in the MapleCloud is 29 and is the same as the version installed in this computer, created June 23, 2025, 10:25 hours Eastern Time.`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1877 and is the same as the version installed in this computer, created 2025, July 11, 19:24 hours Pacific Time.`

> 

restart;
> 

eq:=-A^2*exp(2*B*x)+A*B*exp(B*x)-2*A*C*exp(B*x)-C^2-a*cos(b*x)^m*(A*exp(B*x)+C+1)=0;

-A^2*exp(2*B*x)+A*B*exp(B*x)-2*A*C*exp(B*x)-C^2-a*cos(b*x)^m*(A*exp(B*x)+C+1) = 0

> 

the_vars:=[A, B, C,m]: #all variables are listed
solve(identity(eq,x),the_vars);

[[A = 0, B = B, C = -(1/2)*a-(1/2)*(a^2-4*a)^(1/2), m = 0], [A = 0, B = B, C = -(1/2)*a+(1/2)*(a^2-4*a)^(1/2), m = 0], [A = -C-(1/2)*a-(1/2)*(a^2-4*a)^(1/2), B = 0, C = C, m = 0], [A = -C-(1/2)*a+(1/2)*(a^2-4*a)^(1/2), B = 0, C = C, m = 0]]

> 

the_vars:=[A, B, C]:   #forget to add m variable to list, now it gives internal error variables are listed
solve(identity(eq,x),the_vars);

Error, (in depends) too many levels of recursion

> 

 


 

Download missing_variable_solve_sept_6_2025.mw

 

6. odesteps gives internal error (was question before, moved it to here, so all in one place)
 

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

SupportTools:-Version();

`The Customer Support Updates version in the MapleCloud is 29 and is the same as the version installed in this computer, created June 23, 2025, 10:25 hours Eastern Time.`

> 

restart;
> 

ode:=x^2*diff(y(x),x$2)+(x^2-5*x)*diff(y(x),x)+(5-6*x)*y(x)=0; #22942.  

x^2*(diff(diff(y(x), x), x))+(x^2-5*x)*(diff(y(x), x))+(5-6*x)*y(x) = 0

> 

sol:=dsolve(ode);

y(x) = c__1*x^5*(x+5)+c__2*x*(x^4*(x+5)*Ei(1, x)+(-x^4-4*x^3+3*x^2-4*x+6)*exp(-x))

> 

Student:-ODEs:-ODESteps(ode)

Warning, cannot verify that the given particular solution, y(x) = 1+1/5*x, actually solves the corresponding homogeneous ODE, diff(diff(y(x),x),x)+1/x*(x-5)*diff(y(x),x)-(-5+6*x)/x^2*y(x) = 0

Error, (in Student:-ODEs:-ChangeVariables) the ODE, diff(diff(U(T),T),T) = 5*(T^2+6*T-5)/T^2/(5+T)*U(T)-diff(U(T),T)*(T^2+2*T-25)/T/(5+T), contains the undifferentiated dependent variable, U(T), but the transformation %3, does not

> 

 


 

Download internal_error_ODESteps_sept_2_2025.mw

fyi, Maple 2025 new interface video ...

nm 11398 Maple
interface
March 13 2025
1 2

fyi, there is new video showing Maple's 2025 new interface

It seems oriented to document mode which I do not use. May be they also improved worksheet mode.

I am still getting my Maple desktop getting shuffled few times each day where I have to close Maple and reopen it to clear it. I hope they fixed this in the new interface.,

Change Maple name to make search easier...

nm 11398 Maple
March 03 2025
2 5

To Maplesoft,

Please consider changing the name from Maple to something else.

It is almost impossible to search for anything related to maple, since google keeps giving results about trees called Maple in Canada and about some maple syrup products which I have no interest in at all.

One has to go through pages and pages of links looking for a real Maple software hit.

I know the name Maple has been around for long time, but a new unique name will make searching easier and people will get used to the new name very quickly (may be in 1-2 years).

Some examples:

 

I know when Maple was created almost 40 years ago, the inernet itself was not even here (I forgot when VP. Gore created the internet but I think that was in early 90's), and search was not thought about then.

But these days, the ability to search for something and to easily find it is very important for companies and having a unique name for Maple will make it also much more popular and easier to find things about it instead of finding  information about Maple syrup and Maple trees all the time.

This is posted  under product suggestions.

Maple 2023 - what would be your 3 top b...

nm 11398 Maple
February 14 2023
4 2

I did not see such a post for 2023 so I am starting one.

What is your 3 top bug fixes or improvements  you would like to see in Maple 2023? 

Here are mine

  1. Fix timelimit so that it completes at or near the time requested and not hang or take 10 hrs when asked to timeout after say 30 seconds.
  2. Fix the large amount of server crashes and the many random hangs when running large computation that takes long time. i.e. Make Maple more robust.
  3. Allow the user to remove output from worksheet while it is still running (Evaluate->Remove output from worksheet)

Maple is a nice language and has many nice functions. But it is the usability part of Maple that leaves many bad impressions because of these things that should really have been fixed by now given how long  Maple software have been around.

Remove output during computation...

nm 11398 Maple 2022
gui editing
October 28 2022
2 3

Any chance to have "Evaluate->Remove Output From Worksheet" become active and usable when one is still running something in the worksheet?  May be in 2023 version?

This is something that has been missing in Maple for ages.

Maple definitely slows down when the worksheet becomes full of output (from print messages) when a command has been running for long time. Now there is no way to remove the output in the worksheet until the command completes which can take hours. May be this slow down because the scrolling/writing to the worksheet slows down, and this affects how long it takes to complete as the engine is waiting for the frontend to finish writing to the worksheet?. I do not know. I just know Maple slows down when this happens.

I do not understand why Maple can't implement this. Is there a tehnical reson which will make removing current output in the worksheet not possible while a command is running?

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