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Wrong root of sinc expression...

Asked by: C_R 3752
solve rootof allsolutions
3 hours ago
1  0

Here is another case where an incorrect solution of a non-algebraic expression is returned. 

How to make Maple exclude solutions obtained with allsolutions where the expression is not defined?

IMO, allsolutions facilities of Maple should do this automatically. Anything from a mathematical point of view that speaks against an automatic exclusion?

(Are there other commands that provide a correct solution?) 

By the way:
 

solve(sin(x)/x)


does not return a single solution as stated on the solve help page ("In general for transcendental equations, the solve command returns only one solution,...") because solve correctly discards x=0 but does not consider returning x=pi.

 

> 

restart
> 

expr := sin(x)/x

sin(x)/x

 (1)

The above expression is not defined at x = 0

> 

Eval(expr, x = 0)

Eval(sin(x)/x, x = 0)

 (2)
> 

value(Eval(sin(x)/x, x = 0))

Error, (in value/Eval) numeric exception: division by zero

  

Roots of the expression with RootOf

> 

sol := allvalues(RootOf(expr))

Pi*_Z1

 (3)
> 

indets(sol)

{_Z1}

 (4)
> 

about({_Z1}[])

Originally _Z1, renamed _Z1~:
  is assumed to be: integer
 

  
> 

getassumptions({_Z1})

{_Z1::integer}

 (5)
> 

type(0, integer)

true

 (6)
> 

subs(x = sol, expr) = 0

sin(Pi*_Z1)/(Pi*_Z1) = 0

 (7)
> 

is(sin(Pi*_Z1)/(Pi*_Z1) = 0)

true

 (8)

The above should be false because expr is not defined for _Z1 = 0.However, this is what automatic simplifcation does behind the scenes with the output (7) 

> 

sin(Pi*_Z1)/(Pi*_Z1) = 0

0 = 0

 (9)

For this particular case Maple should have returned a special name expressing nonzero integers, like _NZ .
`ℤ__≠0`or `minus`(integer, {0})or `#msup(mi("ℤ",fontstyle = "normal"),mo("*"))`are common symbols for that
So _Zis incorrect in the solution and automatic simplification does something wrong.
Only substituing everything at once leads to a correct response:

> 

subs(x = sol, _Z1 = 0, expr)

Error, numeric exception: division by zero

  


Solve

> 

solve(expr, x)
> 

x_sol := [solve(expr, x, allsolutions)]

[2*Pi*_Z2, Pi*(2*_Z2+1)]

 (10)
> 

indets(x_sol)

{_Z2}

 (11)
> 

subs(x = x_sol[1], expr) = 0

(1/2)*sin(2*Pi*_Z2)/(Pi*_Z2) = 0

 (12)
> 

is((1/2)*sin(2*Pi*_Z2)/(Pi*_Z2) = 0)

true

 (13)
> 

(1/2)*sin(2*Pi*_Z2)/(Pi*_Z2) = 0

0 = 0

 (14)
> 

subs(x = x_sol[1], _Z2 = 0, expr) = 0

Error, numeric exception: division by zero

  

Again _Z2 = 0is not a valid solution for the first solution butNULLworks for the second solution

> 

subs(x = x_sol[2], expr) = 0

sin(Pi*(2*_Z2+1))/(Pi*(2*_Z2+1)) = 0

 (15)
> 

is(sin(Pi*(2*_Z2+1))/(Pi*(2*_Z2+1)) = 0)

true

 (16)
> 

sin(Pi*(2*_Z2+1))/(Pi*(2*_Z2+1)) = 0

0 = 0

 (17)

Substituing everything at once works

> 

subs(x = x_sol[2], _Z2 = 0, expr) = 0

sin(Pi)/Pi = 0

 (18)
> 

sin(Pi)/Pi = 0

0 = 0

 (19)

However, the second solution does not cover all solutions (it misses even multiples of π)

> 

[seq({_Z2}[] = i, i = -2 .. 2)]

[_Z2 = -2, _Z2 = -1, _Z2 = 0, _Z2 = 1, _Z2 = 2]

 (20)
> 

seq(subs([_Z2 = -2, _Z2 = -1, _Z2 = 0, _Z2 = 1, _Z2 = 2][i], x_sol[2]), i = 1 .. nops([_Z2 = -2, _Z2 = -1, _Z2 = 0, _Z2 = 1, _Z2 = 2]))

-3*Pi, -Pi, Pi, 3*Pi, 5*Pi

 (21)

 

Related topic: I also think that new users and students should profit from a directly understandable output like this

Maybe adding new convert form is an option.

 

 

Download roots_of_sinc.mw

license error starting OpenMaple session...

Asked by: goebeld 65
openmaple license
22 hours ago
0  0

I do have a stundent license permanently and I've installed the OpenMaple java examples: JCEngineCallBacks, JCHelpCallBack, jcmaple in Eclipse.

I've also installed the MapleTest.java which runs fine.

When I start the jcmaple.java I get the error: license communication problem 1  Error starting OpenMaple session

So I don't know why.

Meanwhile I was able to solve the issue

Maximizing, with a constraint...

Asked by: Alfred_F 525
optimization
April 20 2026
1  5

...and starting values. I want to reproduce the maximum in Maple using the solution structure in the attached file, similar to the old Mathcad method. Instead of using the Euler-Lagrange equation, I want to separately enter the objective function, then the boundary conditions, and finally the starting values ​​for an iteration (as was done in the old Mathcad solution block). I entered the latter into the "maximize" command using the Maple help text. But nothing is being calculated. What am I doing wrong? As I said, I only want a numerically generated approximate solution.test.mw

> 

restart
> 

kernelopts(version)

`Maple 2026.0, X86 64 WINDOWS, Mar 05 2026, Build ID 2001916`

 (1)
> 

interface(version)

`Standard Worksheet Interface, Maple 2026.0, Windows 11, March 05 2026 Build ID 2001916`

 (2)
> 

with(VariationalCalculus)

[ConjugateEquation, Convex, EulerLagrange, Jacobi, Weierstrass]

 (3)
> 

with(plots, implicitplot)

[implicitplot]

 (4)
> 

with(Optimization)

 

> 

assume(x >= 0, y(x) >= 0)
> 

"p(a,b,c,x):=a∗x^(2)+b∗x+c;"

proc (a, b, c, x) options operator, arrow, function_assign; a*x^2+b*x+c end proc

 (5)
> 

" q(d,f,x):=d∗x^(2)+f∗x;"

proc (d, f, x) options operator, arrow, function_assign; d*x^2+f*x end proc

 (6)
> 

"yn(a,b,c,d,f,g,x):=p(a,b,c,x)∗exp(q(d,f,x))+g;"

proc (a, b, c, d, f, g, x) options operator, arrow, function_assign; p(a, b, c, x)*exp(q(d, f, x))+g end proc

 (7)
> 

" wn(a,b,c,d,f,g,xend):=(∫)[0]^(xend)x∗yn(a,b,c,d,f,g,x)ⅆx;"

proc (a, b, c, d, f, g, xend) options operator, arrow, function_assign; int(x*yn(a, b, c, d, f, g, x), x = 0 .. xend) end proc

 (8)
> 

"constr(a,b,c,d,f,g,xend):=(∫)[0]^(xend)(sqrt(1+((ⅆ)/(ⅆx)(yn(a,b,c,d,f,g,x)))^(2))-50)ⅆx=0;"

proc (a, b, c, d, f, g, xend) options operator, arrow, function_assign; int(sqrt(1+(diff(yn(a, b, c, d, f, g, x), x))^2)-50, x = 0 .. xend) = 0 end proc

 (9)

 

> 

maximize(wn(a, b, c, d, f, g, xend), constr(a, b, c, d, f, g, xend), initialpoint = {a = -0.2e-1, b = 1.06, c = 0.14e-2, d = 0.46e-3, f = -0.12e-2, g = -0.14e-2, xend = 30})

maximize(-(1/16)*(8*a*xend^2*(-d)^(11/2)*exp(d*xend^2+f*xend)-8*g*xend^2*(-d)^(13/2)+4*a*f*xend*(-d)^(9/2)*exp(d*xend^2+f*xend)+8*b*xend*(-d)^(11/2)*exp(d*xend^2+f*xend)+2*exp(d*xend^2+f*xend)*(-d)^(7/2)*a*f^2+4*b*f*(-d)^(9/2)*exp(d*xend^2+f*xend)+8*c*(-d)^(11/2)*exp(d*xend^2+f*xend)-erf((1/2)*(2*d*xend+f)/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*d^3*a*f^3+2*erf((1/2)*(2*d*xend+f)/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*d^4*b*f^2-4*erf((1/2)*(2*d*xend+f)/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*d^5*c*f+8*a*(-d)^(9/2)*exp(d*xend^2+f*xend)+erf((1/2)*f/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*a*f^3*d^3-2*erf((1/2)*f/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*b*f^2*d^4+4*erf((1/2)*f/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*c*f*d^5-2*a*f^2*(-d)^(7/2)-4*b*f*(-d)^(9/2)-8*c*(-d)^(11/2)+6*erf((1/2)*(2*d*xend+f)/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*d^4*a*f-4*erf((1/2)*(2*d*xend+f)/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*d^5*b-6*erf((1/2)*f/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*a*f*d^4+4*erf((1/2)*f/(-d)^(1/2))*Pi^(1/2)*exp(-(1/4)*f^2/d)*b*d^5-8*a*(-d)^(9/2))/(-d)^(13/2), int((1+((2*a*x+b)*exp(d*x^2+f*x)+(a*x^2+b*x+c)*(2*d*x+f)*exp(d*x^2+f*x))^2)^(1/2)-50, x = 0 .. xend) = 0, initialpoint = {a = -0.2e-1, b = 1.06, c = 0.14e-2, d = 0.46e-3, f = -0.12e-2, g = -0.14e-2, xend = 30})

 (10)

 

Download test.mw

Shortcut to enter colon-dash?...

Asked by: C_R 3752
command-completion shortcut colon-dash
April 16 2026
0  0

The command completion facility is real time saver. On the other hand, entering the colon dash is not fluent since it requires searching the keys on the key board.

I was wondering if there is a keyboard shortcut that enters both characters at once.

Replacing placeholder names in nested RootOfs...

Asked by: C_R 3752
integral
April 08 2026
0  4

Is there an easier or shorter way to do the following? Any handy package command?

RootOf(-(Int(1/sqrt(2*cos(_a)+RootOf(-(Int(1/sqrt(2*cos(_a)+_Z), _a = 0 .. Pi))+_a+c__2)), _a = 0 .. _Z))+x+c__2)

RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2))^(1/2), _a = 0 .. _Z))+x+c__2)

 (1)

indets(RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2))^(1/2), _a = 0 .. _Z))+x+c__2), 'specfunc(anything, RootOf)')

{RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2), RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2))^(1/2), _a = 0 .. _Z))+x+c__2)}

 (2)

subs(_a = _b, {RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2), RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2))^(1/2), _a = 0 .. _Z))+x+c__2)}[1])

RootOf(-(Int(1/(2*cos(_b)+_Z)^(1/2), _b = 0 .. Pi))+_b+c__2)

 (3)

subs({RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2), RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2))^(1/2), _a = 0 .. _Z))+x+c__2)}[1] = RootOf(-(Int(1/(2*cos(_b)+_Z)^(1/2), _b = 0 .. Pi))+_b+c__2), RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_a)+_Z)^(1/2), _a = 0 .. Pi))+_a+c__2))^(1/2), _a = 0 .. _Z))+x+c__2))

RootOf(-(Int(1/(2*cos(_a)+RootOf(-(Int(1/(2*cos(_b)+_Z)^(1/2), _b = 0 .. Pi))+_b+c__2))^(1/2), _a = 0 .. _Z))+x+c__2)

 (4)

NULL

Related question: Is that substitution mathematically correct or does the _a belong to the outermost RootOf?

Download parameters_in_nested_RootOf.mw

Substitution in pde with conjugate?...

Asked by: salim-barzani 1750
substitution pde differential-equations
April 07 2026
0  0

most of time is give me true my substittuetion but  a lot time i saw it is not make my substittuetion true and this time i figure out which author did   and outcome is what i am looking but when i do that is so different where is problem 

f-m.mw

How to find equation involving two odes?...

Asked by: salim-barzani 1750
ode parameters differential-equations
April 07 2026
0  0

In here i did try my best and my equation outcome are ok but is not same as author did i dont know why, beside this he try to use two ode for constructing  a new ode which find of one solution of this can be the third solution of ode!
 i have to use eq(5) for my orginal ode  but eq(5) contain f(x) and g(x) which by some assumption  and taking two other ode eq(6) and eq(7)  they construct new one which is eq(14) and by f(xi) and g(xi) have corelation with W(xi) which is third ode  as in eq(9) and eq(11) mentioned, i try to use the solution which author mentioned but is not give me solution of third ode by using corelation what is problem here? also in eq(21)  and eq(25) when thus parameter are satisfy must our odetest be zero

i will update two maple file which realted separatly for constructing  equations and other is for apply and satisfy the solution for ode!

F-p.mw

ode-17.mw

there is any code for converting hyper-->trig?...

Asked by: salim-barzani 1750
trig convert trigh
April 04 2026
0  2

 a while ago there is a code for changing function from trig to hyperbolic and viceversa  but i can't find that code except changind xi=I*xi there is another one?

restart

S3 := G(xi) = -(sqrt(Omega)*(tanh(sqrt(Omega)*xi)+I*sech(sqrt(Omega)*xi))+B)/(2*C); S4 := G(xi) = -(sqrt(Omega)*(tanh(sqrt(Omega)*xi)-I*sech(sqrt(Omega)*xi))+B)/(2*C)

G(xi) = -(1/2)*(Omega^(1/2)*(tanh(Omega^(1/2)*xi)-I*sech(Omega^(1/2)*xi))+B)/C

 (1)

convert(rhs(S3), trig)

-(1/2)*(Omega^(1/2)*(tanh(Omega^(1/2)*xi)+I*sech(Omega^(1/2)*xi))+B)/C

 (2)

NULL

Download convert.mw

multi limit fail, but separate limits works...

Asked by: nm 12253
limit incomplete-question
April 02 2026
0  4

Maple 2026 and Maple 2025.2

Is this a bug in limit? or as designed?

Doing 

limit(sol,[_C3 = 0, _C4 = 0])

Gives internal error. But

limit(sol,_C3 = 0);
limit(%,_C4 = 0);

works and no error.

Worksheet below. I've had problems before with multilimit. I think I need to change my code to do limit one by one from now on.

> 

interface(version);

`Standard Worksheet Interface, Maple 2026.0, Windows 10, March 05 2026 Build ID 2001916`

> 

restart;
> 

sol:=(piecewise(t <= 0,0,t <= Pi,(arctan(tan(t))*cos(t)*_C3*_C4+arctan(tan(t))*sin(t)*_C4^2-cos(t)*_C3*_C4*t+sin(t)*_C3^2*t)/(_C3*cos(t)+_C4*sin(t)),Pi < t,Pi*_C3*(tan(t)*_C3-_C4)/(tan(t)*_C4+_C3))+2*_C3^2+2*_C4^2)*(_C3*cos(t)+_C4*sin(t))/(2*_C3^2+2*_C4^2)

sol := (piecewise(t <= 0, 0, t <= Pi, (arctan(tan(t))*cos(t)*_C3*_C4+arctan(tan(t))*sin(t)*_C4^2-cos(t)*_C3*_C4*t+sin(t)*_C3^2*t)/(cos(t)*_C3+_C4*sin(t)), Pi < t, Pi*_C3*(tan(t)*_C3-_C4)/(tan(t)*_C4+_C3))+2*_C3^2+2*_C4^2)*(cos(t)*_C3+_C4*sin(t))/(2*_C3^2+2*_C4^2)

> 

limit(sol,[_C3 = 0, _C4 = 0])

Error, (in limit/multi/ldegree1) invalid input: limit/multi/ReIm expects its 1st argument, f, to be of type polynom, but received _DIR1*cos(t)+_DIR2*sin(t)

> 

limit(sol,_C3 = 0)

piecewise(t <= 0, _C4*sin(t), t <= Pi, (1/2)*arctan(tan(t))*sin(t)+_C4*sin(t), _C4*sin(t))

> 

limit(%,_C4 = 0)

piecewise(t <= 0, 0, t <= Pi, (1/2)*arctan(tan(t))*sin(t), 0)

 

 

Download limit_problem_april_2_2026.mw

Automating Maple-to-LaTeX workflow...

Asked by: salim-barzani 1750
export latex incomplete-question
March 31 2026
0  2

Dear MaplePrimes Community,

With the rapid advancement of technology, it has become increasingly important to improve our workflows and reduce repetitive manual tasks. In my research, I frequently use Maple to solve  PDEs and obtain analytical solutions. However, one major difficulty I face is the time-consuming process of manually converting each result into LaTeX format.

In many cases, Maple produces multiple solutions, and I must copy and convert each one individually into LaTeX. This process is tedious, inefficient, and prone to formatting errors.

Therefore, I would like to ask:

Is it possible to establish an automated link or workflow between Maple and LaTeX such that, after solving a problem in Maple, all resulting expressions are automatically exported and inserted into a LaTeX document in the desired format and location?

Ideally, I am looking for a system where:

  • Maple solutions are automatically converted into LaTeX code,

  • The equations are directly placed into a specified LaTeX file or section,

  • The process works for multiple solutions without manual intervention.

Furthermore, if such integration is possible, can this idea be extended to connect Maple with multiple tools (for example, Maple → LaTeX → plotting or document-generation systems), creating a more advanced automated workflow?

I would greatly appreciate any guidance, examples, or best practices for implementing such a system.

Thank you very much for your help.

problem with rsolve and GuessRecurrence...

Asked by: Jean-Michel 70
recurrence incomplete-question lretools
March 28 2026
0  8

Hello :)

I am totally lost with ( I guess) the LREtools package.

See the ws.

The two integer sequences come from the OEIS.

I don't understand why i have a FAILED result.

intseq := [0, 1, 4, 2, 131, 129, 3, 5, 16, 14, 12, 10, 8, 6, 31, 29, 27, 25, 23, 99734, 7, 9, 11, 13, 15, 17, 64, 62, 60, 58, 56, 54, 52, 50, 48, 46, 44, 42, 40, 38, 111, 22, 20, 18, 28, 30, 32, 222, 220, 218, 216, 214, 212, 210, 208, 206, 204, 202, 200, 198, 196]

[0, 1, 4, 2, 131, 129, 3, 5, 16, 14, 12, 10, 8, 6, 31, 29, 27, 25, 23, 99734, 7, 9, 11, 13, 15, 17, 64, 62, 60, 58, 56, 54, 52, 50, 48, 46, 44, 42, 40, 38, 111, 22, 20, 18, 28, 30, 32, 222, 220, 218, 216, 214, 212, 210, 208, 206, 204, 202, 200, 198, 196]

 (1)

rec := LREtools:-GuessRecurrence(intseq, q(n))

FAIL

 (2)

soln := rsolve(rec, q)

Error, (in rsolve/single) Equations do not involve function q()

  

restart

NULL

intseq := [0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 18, 42, 17, 43, 16, 44, 15, 45, 14, 46, 79, 113, 78, 114, 77, 39, 78, 38, 79, 37, 80, 36, 81, 35, 82, 34, 83, 33, 84, 32, 85, 31, 86, 30, 87, 29, 88, 28, 89, 27, 90, 26, 91, 157, 224, 156, 225, 155]

[0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 18, 42, 17, 43, 16, 44, 15, 45, 14, 46, 79, 113, 78, 114, 77, 39, 78, 38, 79, 37, 80, 36, 81, 35, 82, 34, 83, 33, 84, 32, 85, 31, 86, 30, 87, 29, 88, 28, 89, 27, 90, 26, 91, 157, 224, 156, 225, 155]

 (3)

rec := LREtools:-GuessRecurrence(intseq, q(n))

FAIL

 (4)

NULL

restart

with(LREtools)

intseq := [0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 18, 42, 17, 43, 16, 44, 15, 45, 14, 46, 79, 113, 78, 114, 77, 39, 78, 38, 79, 37, 80, 36, 81, 35, 82, 34, 83, 33, 84, 32, 85, 31, 86, 30, 87, 29, 88, 28, 89, 27, 90, 26, 91, 157, 224, 156, 225, 155]

[0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 18, 42, 17, 43, 16, 44, 15, 45, 14, 46, 79, 113, 78, 114, 77, 39, 78, 38, 79, 37, 80, 36, 81, 35, 82, 34, 83, 33, 84, 32, 85, 31, 86, 30, 87, 29, 88, 28, 89, 27, 90, 26, 91, 157, 224, 156, 225, 155]

 (5)

NULL

rec := GuessRecurrence(intseq, q(n))

FAIL

 (6)

NULL

NULL Thank you everyone.

Jean-Michel

Download rsolve_and_LREtools.mw

Bug in XMLTools:-ParseFile...

Asked by: Anthrazit 925
xmltools
March 16 2026
0  3

There seems to be a regression in Maple 2026 in the XMLTools:-ParseFile function.

As Maple2026 is not yet in the list of products to be chosen, I have added it in the subject.

Error, (in XMLTools:-ParseFile) invalid input: too many and/or wrong type of arguments passed to XMLTools:-NSXML:-Parser:-ParseFile; first unused argument is prolog = true

The test file is right from the help related to ParseFile.
Test_XML.mw

MapleFlow documentation and tech support...

Asked by: rquirt 95
documentation online
March 16 2026
2  2

I'm new to MapleFlow, and I have a few questions about MapleFlow help.

  1. I read the recent post about the release of MapleFlow 2025.2, and it mentions some new functionality and bug fixes.  Is there a "What's new in MaplleFlow 2025.2" section in a help file, online or offline, that lists the new features and bug fixes?
  2. I can find Online Help for Maple, MapleSim and MapleSim Toolboxes, but I can't find a section for MapleFlow.  I realize that MapleFlow and Maple share a lot of functionality, so the Maple section covers the functions, but there are MapleFlow-specific features that don't seem to have their own section in the Online help.
  3. The offline MapleFlow help seems rather dated and limited.  When was the last time any updates were made?  Are there plans to continue to improve the offline MapleFlow help?
  4. I have a few tech support questions in, and I have received some feedback, but at least one has been sent to the Math group for review, and it's been about a week, and I've heard nothing.  Is there somewhere we can check the status of our tech support issues?

Thanks

95% of memory occupied and several hours...

Asked by: Gabriel Barcellos 80
performance fsolve
March 13 2026
0  0

Objective: Solve a system of two equations.

Obstacle: Generating these two equations depends on millions of previous combinations as well as derivatives.

In other words, we've reached the maximum limit that Maple on my computer can handle.

What would be better, to leave the equations aside or to upgrade my computer?

> 

restart
> 

with(plots)
> 

with(linalg)
> 

H01 := -gamma11*S11-gamma12*S12-gamma13*S13-gamma14*S14-gamma15*S15-gamma16*S16-gamma17*S17-gamma18*S18-gamma19*S19-gamma110*S110-gamma111*S111-gamma112*S112-eta1*(S11^2+S110^2+S111^2+S112^2+S12^2+S13^2+S14^2+S15^2+S16^2+S17^2+S18^2+S19^2)-J1*(S11*S12+S12*S13+S13*S14+S14*S18+S18*S112+S112*S111+S111*S110+S110*S19+S19*S15+S15*S11+S16*(S12+S110+S15+S17)+S17*(S113+S111+S18))
> 

H02 := -gamma21*S21-gamma22*S22-gamma23*S23-gamma24*S24-gamma25*S25-gamma26*S26-gamma27*S27-gamma28*S28-gamma29*S29-gamma210*S210-gamma211*S211-gamma212*S212-eta2*(S21^2+S210^2+S211^2+S212^2+S22^2+S23^2+S24^2+S25^2+S26^2+S27^2+S28^2+S29^2)-J1*(S21*S22+S22*S23+S23*S24+S24*S28+S28*S212+S212*S211+S211*S210+S210*S29+S29*S25+S25*S21+S26*(S22+S210+S25+S27)+S27*(S213+S211+S28))
> 

Z01 := exp(-beta*H01)
> 

Z01 := add(add(add(add(add(add(add(add(add(add(add(add(Z01, S11 = [-2, -1, 0, 1, 2]), S12 = [-2, -1, 0, 1, 2]), S13 = [-2, -1, 0, 1, 2]), S14 = [-2, -1, 0, 1, 2]), S15 = [-2, -1, 0, 1, 2]), S16 = [-2, -1, 0, 1, 2]), S17 = [-2, -1, 0, 1, 2]), S18 = [-2, -1, 0, 1, 2]), S19 = [-2, -1, 0, 1, 2]), S110 = [-2, -1, 0, 1, 2]), S111 = [-2, -1, 0, 1, 2]), S112 = [-2, -1, 0, 1, 2])
> 

NULL
> 

Z02 := exp(-beta*H02)
> 

Z02 := add(add(add(add(add(add(add(add(add(add(add(add(Z02, S21 = [-2, -1, 0, 1, 2]), S22 = [-2, -1, 0, 1, 2]), S23 = [-2, -1, 0, 1, 2]), S24 = [-2, -1, 0, 1, 2]), S25 = [-2, -1, 0, 1, 2]), S26 = [-2, -1, 0, 1, 2]), S27 = [-2, -1, 0, 1, 2]), S28 = [-2, -1, 0, 1, 2]), S29 = [-2, -1, 0, 1, 2]), S210 = [-2, -1, 0, 1, 2]), S211 = [-2, -1, 0, 1, 2]), S212 = [-2, -1, 0, 1, 2])
> 

NULL
> 

G0 := -(1/24)*N*ln(Z01*Z02)/beta
> 

NULL
> 

m01 := -24*(diff(G0, gamma11))/N
> 

m02 := -24*(diff(G0, gamma21))/N
> 

NULL
> 

beta := 11.605/T; gamma11 := 2*J1*m1+2*J2*m2; eta1 := Delta; gamma21 := 2*J1*m2+2*J2*m1; eta2 := Delta; gamma12 := J1*m1+2*J2*m2; gamma22 := J1*m2+2*J2*m1; gamma13 := J1*m1+2*J2*m2; gamma23 := J1*m2+2*J2*m1; gamma14 := 2*J1*m1+2*J2*m2; gamma24 := 2*J1*m2+2*J2*m1; gamma15 := J1*m1+2*J2*m2; gamma25 := J1*m2+2*J2*m1; gamma16 := 2*J2*m2; gamma26 := 2*J2*m1; gamma17 := 2*J2*m2; gamma27 := 2*J2*m1; gamma18 := J1*m1+2*J2*m2; gamma28 := J1*m2+2*J2*m1; gamma19 := 2*J1*m1+2*J2*m2; gamma29 := 2*J1*m2+2*J2*m1; gamma110 := J1*m1+2*J2*m2; gamma210 := J1*m2+2*J2*m1; gamma111 := J1*m1+2*J2*m2; gamma211 := J1*m2+2*J2*m1; gamma112 := 2*J1*m1+2*J2*m2; gamma212 := 2*J1*m2+2*J2*m1
> 

NULL
> 

eq1 := m1 = m01
> 

eq2 := m2 = m02
> 

fsolve(subs(J1 = 2*.83, N = 1, J2 = -2*.58, Delta = 0, m1 = 0.1e-1, {eq1, eq2}), {T, m2}, T = 0 .. 220, m2 = -.1 .. .1)
> 

fsolve(subs(J1 = 2*.83, N = 1, J2 = -2*.58, T = 1, Delta = 0, {eq1, eq2}), {m1, m2}, m1 = -5 .. 5, m2 = -5 .. 5)

{m1 = 2.000000000, m2 = -2.000000000}

 (1)

NULL

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Pallets not working with Maple 2026...

Asked by: C_R 3752
palette
March 13 2026
0  2

After system restart on Windows 11:

Maple 2026 was installed as usual with administrator rights and with import of preferences from Maple 2025. Other Maple versions are working on the same computer.

Does this never-seen-before output gives a hint what is wrong with my installation. Any suggestions what to do next?

That's the installed version:

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