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This page lists MaplePrimes questions that have not yet received an answer
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How to solve term7?...

Asked by: Alfred_F 245
integral
1 hour ago
0  0

I'm doing something wrong again in the attached file. Please advise.

test.mw

bug report: Another reproducible server crash in M...

Asked by: nm 10718
14 hours ago
1  1

This crashes the kernel each and everytime. I was testing a solution which is most likely wrong. But this does not mean Maple should just crash like this. ps. I do not remember if I reported this before or not for this exact example, hard to search Mapleprimes. If I did report this exact example before in the past, then it is still not fixed.

Does this happen in Maple 2025?


Worksheet below. Make sure to save all your work first.

maple_server_crash_on_odetest_march_15_2025.mw

Why the MaplePrimes outage?...

Asked by: Carl Love 27716
outage
16 hours ago
1  6

So, MaplePrimes is now accessible again after an unprecedented 5-day outage. What happened? There was no announcement of the outage beforehand, making it seem like an accident. How could it take 5 days to recover from an accident? I don't see any differences yet, so it doesn't seem as if the software that runs MaplePrimes was being updated. There's usually some official announcement of these things, but I don't see any.

generate a sequence backwards ...

Asked by: selaf 15
recursion incomplete-question
March 13 2025
0  1

I am trying to do something that was recommended in

https://math.stackexchange.com/questions/4583857/how-to-use-recursion-to-define-a-number-series-in-maple

but can't get the desired sequnce. See for example my code

v := proc(m) option remember; return m; end proc;
k := 5:
v(k + 1) := 0:
v(k):=1:
for i from k - 1 by -1 to 1 do
    v(i);
end do;

I get the output 1,1,1,1

I don't get it.

Show steps for viscous Burger's equation...

Asked by: 130
solve
March 11 2025
0  2

Hi!

I am studying Burger's equation, and I would like to see the steps that Maple takes to solve this.  "ShowSteps" doesn't seem to work.

Unfortunately, I am unable to share the worksheet I made.

Server Error - MaplePrimes

 
 

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Is wamp.mapleprimes.com a legitamate site?...

Asked by: Christopher2222 5890
March 10 2025
0  2

Performing a search brought some results from wamp.mapleprimes.com. 

I clicked on it and firefox gave me a warning.  Is wamp.mapleprimes.com a legitamate site???

Unable to parse - MapleFlow...

Asked by: Christopher2222 5890
syntax differentiation
March 09 2025
0  2

What am I missing here?  I type in a simple differential equation and I get .. unable to parse error.

make faster and explicit way for plotting?...

Asked by: SSMB 90
performance explore numeric
March 08 2025
4  2

this function i have is so long and my parameter are twenty they are two much when i make a change in explore i the change is so slow and i can't see some of this parameter how act to figure when i change becuase the placement of parameters i want some of parameter being in right  and some of them being in right  and figure be in the middle for see them together can we do something like that?

figure.mw

Is LieAlgebras[Cohomology] broken in Maple 2024.2?...

Asked by: Massimo Bertolotti 5
liealgebra cohomology
March 07 2025
1  0

Hi everyone,

I'm trying to compute the cohomology group of some Lie algebras using the LieAlgebra package, but it appears that the Cohomology command doesn't provide the correct basis for the higher dimensional cohomology group, instead repeating up to the correct dimension only one element.

For example, with the following Lie algebra

L1:=_DG([["LieAlgebra", Alg1, [6]], [[[1, 3, 2], 1], [[1, 2, 3], -1], [[4, 6, 5], 1], [[4, 5, 6], -1]]])
DGSetup(L1)

the command

C := RelativeChains([])

does provide the correct k-forms on Alg1, but then

H := Cohomology(C)
provides
[[theta4,theta1],[theta1 &w theta4, theta1 &w theta4, theta1 &w theta4],[theta1 &w theta2 &w theta3,theta1 &w theta2 &w theta3,theta1 &w theta2 &w theta3,theta1 &w theta2 &w theta3], [theta1 &w theta2 &w theta3 &w theta4,theta1 &w theta2 &w theta3 &w theta4,theta1 &w theta2 &w theta3 &w theta4],[theta1 &w theta2 &w theta3 &w theta4 &w theta5 &w theta6, theta1 &w theta2 &w theta3 &w theta4 &w theta5 &w theta6], [theta1 &w theta2 &w theta3 &w theta4 &w theta5 &w theta6]

A similar thing does happen for the examples provided in the online help (e.g. example 1 from https://de.maplesoft.com/support/help/Maple/view.aspx?path=DifferentialGeometry/LieAlgebras/Cohomology). Is the command broken?

Any help is really appreciated.

what is problem why i can't get result?...

Asked by: salim-barzani 600
substitution pde differential-equations
March 05 2025
3  2
> 

restart
> 

with(PDEtools)
> 

undeclare(prime, quiet); declare(u(x, y, z, t), quiet); declare(f(x, y, z, t), quiet)

``

 (1)
> 

thetai := k[i]*(t*w[i]+y*l[i]+z*r[i]+x)
> 

eqw := w[i] = (-1+sqrt(-4*beta*mu*l[i]-4*delta*mu*r[i]-4*mu*k[i]^2-4*alpha*mu+1))/(2*mu)
> 

Bij := proc (i, j) options operator, arrow; -24*mu/(sqrt(1+(-4*beta*l[j]-4*delta*r[j]-4*alpha)*mu)*sqrt(1+(-4*beta*l[i]-4*delta*r[i]-4*alpha)*mu)-1+((2*r[i]+2*r[j])*delta+(2*l[i]+2*l[j])*beta+4*alpha)*mu) end proc
> 

NULL
> 

theta1 := normal(eval(eval(thetai, eqw), i = 1)); theta2 := normal(eval(eval(thetai, eqw), i = 2))
> 

eqf := f(x, y, z, t) = theta1*theta2+Bij(1, 2)
> 

eqfcomplex := collect(evalc(eval(eval(eqf, l[2] = conjugate(l[1])), l[1] = a+I*b)), t)
> 

eq17 := u(x, y, z, t) = 2*(diff(diff(f(x, y, z, t), x), x))/f(x, y, z, t)-2*(diff(f(x, y, z, t), x))^2/f(x, y, z, t)^2; equ := simplify(eval(eq17, eqfcomplex))

So we want to find a substitution that removes the time dependence from u. One way is to find the maximum and see how it moves. Here, the first solution gives what we want.

> 

ans := solve({diff(rhs(equ), x), diff(rhs(equ), y), diff(rhs(equ), z)}, {x, y, z}, explicit)
 

NULL

Download hfz.mw

There is any way for see the outcome of result? fo...

Asked by: salim-barzani 600
explore substitution plotting
March 05 2025
3  0

i need the result for (eqt33) but i can reach the result there is any  other way for finding? i need to plot 3D of that function but without have the function how i can do explore on it

w1.mw

Not a Maple question, forgive....

Asked by: Christian Wolinski 1630
chatgpt
March 03 2025
0  2

Does this happen to you (ChatGPT session):

How to `Describe` “Iterator:-Product”? ...

Asked by: sursumCorda 1189
product iterator describe
March 03 2025
2  2

I would like to generate a brief description of the object Iterator:-Product but I get the following error:  

Describe(Iterator:-Product);

object Product :: Class<<36893490916968945900>>:

    ModuleApply( )

    ModuleCopy( self::_Product, proto::_Product, 
Error, (in Describe) `proto` does not evaluate to a module

How do I get rid of this message? 

ssystem("dir C:") result is in Spanish...

Asked by: minhhieuh2003 140
ssystem internationalization
March 03 2025
0  1

i used: 
Y := ssystem("dir C:"); print(Y)
result is

[0,"\" El volumen de la unidad C es OS\n El n£mero de serie del volumen es: 54A9-09DA\n\n Directorio de C:\\Program Files\\Maple 2016"

Windows operating system English version but Maple shows Spanish result
I want result is English. Please help me

Y := ssystem("dir C:"):

[0, " El volumen de la unidad C es OS El n£mero de serie del volumen es: 54A9-09DA Directorio de C:\Program Files\Maple 2016 21/02/2025 07:53 AM <DIR> . 22/02/2025 08:34 AM <DIR> .. 21/02/2025 07:50 AM <DIR> afm 21/02/2025 07:55 AM <DIR> bin.X86_64_WINDOWS 21/02/2025 07:52 AM <DIR> data 13/02/2025 07:46 AM <DIR> eBookTools 21/02/2025 07:50 AM <DIR> etc 02/02/2016 05:05 AM 73,861 EULA.html 21/02/2025 07:52 AM <DIR> examples 21/02/2025 07:52 AM <DIR> examplesclassic 21/02/2025 07:52 AM <DIR> Excel 21/02/2025 07:50 AM <DIR> extern 21/02/2025 07:52 AM <DIR> Fonts 13/01/2016 06:39 AM 223,499 Install.html 21/02/2025 07:52 AM <DIR> java 21/02/2025 07:52 AM <DIR> jre 21/02/2025 07:52 AM <DIR> lib 21/02/2025 07:55 AM <DIR> license 27/01/2011 11:13 PM 6,296 Maple Cloud Terms of Service.html 17/02/2016 02:54 PM 5,490,560 MapleToolbox2016.0WindowsX64Installer.exe 13/02/2025 07:48 AM 317,257 Maple_2016_Install_2025_02_13_08_46_07.log 21/02/2025 07:52 AM 317,834 Maple_2016_Install_2025_02_21_08_47_47.log 21/02/2025 07:50 AM <DIR> profiles 21/02/2025 07:52 AM 5,396 readme.txt 21/02/2025 07:52 AM <DIR> redist 21/02/2025 07:52 AM <DIR> samples 21/02/2025 07:52 AM <DIR> uninstall 21/02/2025 07:52 AM <DIR> update 13/02/2025 07:46 AM <DIR> Users 7 archivos 6,434,703 bytes 22 dirs 148,583,636,992 bytes libres"]

 (1)

``

Download language_maple.mw

How find parameter in this equation ?...

Asked by: Arya-S-AA 130
parameters substitution pde
March 02 2025
4  0

i did try but i don't know the result is not come out? also i am not sure to put equation in eq1 in pde or linear part?

> 

restart
> 

with(PDEtools)
> 

with(LinearAlgebra)
> 

NULL
> 

with(SolveTools)
> 

undeclare(prime)

`There is no more prime differentiation variable; all derivatives will be displayed as indexed functions`

 (1)
> 

declare(u(x, y, t))

u(x, y, t)*`will now be displayed as`*u

 (2)
> 

declare(f(x, y, t))

f(x, y, t)*`will now be displayed as`*f

 (3)
> 

pde := diff(u(x, y, t), t, y)+diff(u(x, y, t), `$`(x, 3), y)-3*(diff(u(x, y, t), x))*(diff(u(x, y, t), x, y))-3*(diff(u(x, y, t), `$`(x, 2)))*(diff(u(x, y, t), y))+alpha*(diff(u(x, y, t), x, y))+beta*(diff(u(x, y, t), `$`(x, 2)))

diff(diff(u(x, y, t), t), y)+diff(diff(diff(diff(u(x, y, t), x), x), x), y)-3*(diff(u(x, y, t), x))*(diff(diff(u(x, y, t), x), y))-3*(diff(diff(u(x, y, t), x), x))*(diff(u(x, y, t), y))+alpha*(diff(diff(u(x, y, t), x), y))+beta*(diff(diff(u(x, y, t), x), x))

 (4)
> 

pde_nonlinear, pde_linear := selectremove(proc (term) options operator, arrow; has((eval(term, u(x, y, t) = a*u(x, y, t)))/a, a) end proc, pde)

-3*(diff(u(x, y, t), x))*(diff(diff(u(x, y, t), x), y))-3*(diff(diff(u(x, y, t), x), x))*(diff(u(x, y, t), y)), diff(diff(u(x, y, t), t), y)+diff(diff(diff(diff(u(x, y, t), x), x), x), y)+alpha*(diff(diff(u(x, y, t), x), y))+beta*(diff(diff(u(x, y, t), x), x))

 (5)
> 

eq := u(x, y, t) = -2*(diff(ln(f(x, y, t)), x))

u(x, y, t) = -2*(diff(f(x, y, t), x))/f(x, y, t)

 (6)
> 

eq1 := -(1/2)*numer(normal(eval(pde_linear, eq)))

f(x, y, t)^4*(diff(diff(diff(f(x, y, t), x), x), x))*beta+f(x, y, t)^4*(diff(diff(diff(f(x, y, t), x), x), y))*alpha-f(x, y, t)^3*(diff(f(x, y, t), y))*(diff(diff(f(x, y, t), x), x))*alpha-2*f(x, y, t)^3*(diff(diff(f(x, y, t), x), y))*(diff(f(x, y, t), x))*alpha-3*f(x, y, t)^3*(diff(f(x, y, t), x))*(diff(diff(f(x, y, t), x), x))*beta+2*f(x, y, t)^2*(diff(f(x, y, t), y))*(diff(f(x, y, t), x))^2*alpha+2*f(x, y, t)^2*(diff(f(x, y, t), x))^3*beta+(diff(diff(diff(f(x, y, t), t), x), y))*f(x, y, t)^4+(diff(diff(diff(diff(diff(f(x, y, t), x), x), x), x), y))*f(x, y, t)^4-(diff(diff(f(x, y, t), t), x))*(diff(f(x, y, t), y))*f(x, y, t)^3-(diff(diff(diff(diff(f(x, y, t), x), x), x), x))*(diff(f(x, y, t), y))*f(x, y, t)^3-(diff(diff(f(x, y, t), x), y))*(diff(f(x, y, t), t))*f(x, y, t)^3-4*(diff(diff(diff(f(x, y, t), x), x), x))*(diff(diff(f(x, y, t), x), y))*f(x, y, t)^3-(diff(f(x, y, t), x))*(diff(diff(f(x, y, t), t), y))*f(x, y, t)^3-4*(diff(diff(diff(diff(f(x, y, t), x), x), x), y))*(diff(f(x, y, t), x))*f(x, y, t)^3-6*(diff(diff(f(x, y, t), x), x))*(diff(diff(diff(f(x, y, t), x), x), y))*f(x, y, t)^3+2*(diff(f(x, y, t), x))*(diff(f(x, y, t), t))*(diff(f(x, y, t), y))*f(x, y, t)^2+8*(diff(diff(diff(f(x, y, t), x), x), x))*(diff(f(x, y, t), x))*(diff(f(x, y, t), y))*f(x, y, t)^2+6*(diff(diff(f(x, y, t), x), x))^2*(diff(f(x, y, t), y))*f(x, y, t)^2+24*(diff(diff(f(x, y, t), x), x))*(diff(f(x, y, t), x))*(diff(diff(f(x, y, t), x), y))*f(x, y, t)^2+12*(diff(diff(diff(f(x, y, t), x), x), y))*(diff(f(x, y, t), x))^2*f(x, y, t)^2-36*(diff(diff(f(x, y, t), x), x))*(diff(f(x, y, t), x))^2*(diff(f(x, y, t), y))*f(x, y, t)-24*(diff(f(x, y, t), x))^3*(diff(diff(f(x, y, t), x), y))*f(x, y, t)+24*(diff(f(x, y, t), x))^4*(diff(f(x, y, t), y))

 (7)
> 

NULL
> 

T := f(x, y, t) = h*a[10]+m^2+n^2+a[9]
> 

T1 := m = t*a[3]+x*a[1]+y*a[2]+a[4]
> 

T2 := n = t*a[7]+x*a[5]+y*a[6]+a[8]
> 

T3 := h = a[10]*exp(t*p[3]+x*p[1]+y*p[2])
> 

L2 := expand(subs({T1, T2, T3}, T))

f(x, y, t) = a[10]^2*exp(p[3]*t)*exp(p[1]*x)*exp(p[2]*y)+t^2*a[3]^2+2*t*x*a[1]*a[3]+2*t*y*a[2]*a[3]+x^2*a[1]^2+2*x*y*a[1]*a[2]+y^2*a[2]^2+2*t*a[3]*a[4]+2*x*a[1]*a[4]+2*y*a[2]*a[4]+a[4]^2+t^2*a[7]^2+2*t*x*a[5]*a[7]+2*t*y*a[6]*a[7]+x^2*a[5]^2+2*x*y*a[5]*a[6]+y^2*a[6]^2+2*t*a[7]*a[8]+2*x*a[5]*a[8]+2*y*a[6]*a[8]+a[8]^2+a[9]

 (8)
> 

eq9a := eval(eq1, L2)
> 

indets(%)

{alpha, beta, t, x, y, a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], p[1], p[2], p[3], exp(p[1]*x), exp(p[2]*y), exp(p[3]*t)}

 (9)
> 

p2b := subs({exp(p[1]*x) = eX, exp(p[2]*y) = eY, exp(p[3]*t) = eT}, eq9a); indets(%)

{alpha, beta, eT, eX, eY, t, x, y, a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], p[1], p[2], p[3]}

 (10)
> 

p2c := numer(normal(p2b))
> 

eqns := {coeffs(collect(p2c, {eT, eX, eY}, distributed), {eT, eX, eY})}; nops(%)

5

 (11)
> 

solve(eqns, {a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], p[1], p[2], p[3]})
 

NULL

Download parameters.mw

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