Advanced Search

Question: Why is Maple not calculating the derivative of matrix V (stuck on “Evaluating”)?

Question:Why is Maple not calculating the derivative of matrix V (stuck on “Evaluating”)?

Ahmed111 140 Maple 2024
diff pdetools physics
6 hours ago
0

I defined a 2×2 matrix V with entries involving operator-valued fields u(x,t), ω(x,t), and scalar function β(t). On macOS with Maple 2024.0, when I try to compute the derivative with respect to x using 

Vx := (diff, V, x);

Maple does not return a result. It just shows “Evaluating”

> 

restart
> 

kernelopts(version)

`Maple 2024.0, APPLE UNIVERSAL OSX, Mar 01 2024, Build ID 1794891`

 (1)
> 

with(LinearAlgebra)
> 

with(Physics)
> 

with(PDEtools); undeclare(prime)

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

 (2)
> 

interface(showassumed = 0)
> 

Setup(mathematicalnotation = true)

[mathematicalnotation = true]

 (3)
> 

quantumOperators := {omega, u}

{omega, u}

 (4)
> 

Setup(quantumoperators = quantumOperators)

[quantumoperators = {omega, u}]

 (5)
> 

assume(x::real); assume(t::real)
> 

declare(u(x, t), omega(x, t), B(x, t), alpha(t), beta(t), v1(x, t))

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

  

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

  

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

  

alpha(t)*`will now be displayed as`*alpha

  

beta(t)*`will now be displayed as`*beta

  

v1(x, t)*`will now be displayed as`*v1

 (6)
> 

V := -(1/2)*Matrix([[beta(t)*(diff(omega(x, t), t)), -(diff(u(x, t), t))], [-(diff(u(x, t), t)), -beta(t)*(diff(omega(x, t), t))]])/lambda

Matrix(%id = 36893488152030778900)

 (7)
> 

Vx := diff(V, x)

Download derivativve.mw
Please Wait...