Re: [sage-support] Sagemanifolds error in example notebook

[Eric Gourgoulhon]

Le jeudi 8 février 2024 à 13:46:19 UTC+1, Dominic Steinitz a écrit :

I volunteer


Excellent!  Thank you!
Best wishes,

Eric. 

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Re: [sage-support] Sagemanifolds error in example notebook

[Eric Gourgoulhon]

Le jeudi 8 février 2024 à 03:14:14 UTC+1, Matthias Koeppe a écrit :

On Wednesday, February 7, 2024 at 7:00:07 AM UTC-8 Eric Gourgoulhon wrote:

I don't know about any automated way to check that the example notebooks 
are up to date.


One can use "jupyter nbconvert --to notebook --execute" for this
https://nbconvert.readthedocs.io/en/latest/execute_api.html


Thank you for the tip!
Best wishes,

Eric. 

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Re: [sage-support] Sagemanifolds error in example notebook

[Dominic Steinitz]

I volunteer

On Wednesday 7 February 2024 at 18:30:22 UTC Eric Gourgoulhon wrote:

> Le mercredi 7 février 2024 à 16:00:07 UTC+1, Eric Gourgoulhon a écrit :
>
> Indeed, this notebook is 8 years old and is not at all up to date (there 
> is even Python 2 print commands in it!).
> Please open an issue at the Github repository hosting this notebook:
> https://github.com/ernestyalumni/Gravite/blob/master/EMsage.ipynb
> in order for the author to update it.  
>
>
> In order to avoid any further confusion, I've temporarily removed the link 
> to this notebook from 
> https://sagemanifolds.obspm.fr/examples.html
>
> Any volunteer for providing a nice example notebook about electromagnetism 
> is welcome!
> To publish it on the above page, make it publicly accessible (i.e.  
> readable via nbviewer.org) and send a pull request to 
> https://github.com/sagemanifolds/WebSite
> (or simply send the ipynb file to me)
>
> Eric.
>
>

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Re: [sage-support] Sagemanifolds error in example notebook

[Matthias Koeppe]

On Wednesday, February 7, 2024 at 7:00:07 AM UTC-8 Eric Gourgoulhon wrote:

I don't know about any automated way to check that the example notebooks 
are up to date.


One can use "jupyter nbconvert --to notebook --execute" for this
https://nbconvert.readthedocs.io/en/latest/execute_api.html

 

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Re: [sage-support] Sagemanifolds error in example notebook

[Eric Gourgoulhon]

Le mercredi 7 février 2024 à 16:00:07 UTC+1, Eric Gourgoulhon a écrit :

Indeed, this notebook is 8 years old and is not at all up to date (there is 
even Python 2 print commands in it!).
Please open an issue at the Github repository hosting this notebook:
https://github.com/ernestyalumni/Gravite/blob/master/EMsage.ipynb
in order for the author to update it.  


In order to avoid any further confusion, I've temporarily removed the link 
to this notebook from 
https://sagemanifolds.obspm.fr/examples.html

Any volunteer for providing a nice example notebook about electromagnetism 
is welcome!
To publish it on the above page, make it publicly accessible (i.e.  
readable via nbviewer.org) and send a pull request to 
https://github.com/sagemanifolds/WebSite
(or simply send the ipynb file to me)

Eric.

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Re: [sage-support] Sagemanifolds error in example notebook

[Eric Gourgoulhon]

Hi,

Le mercredi 7 février 2024 à 15:46:05 UTC+1, Dominic Steinitz a écrit :

Great thanks very much - I copied from the example - I guess I should have 
checked the manual - I wonder if there is some way of making sure the 
examples are always up to date.


Indeed, this notebook is 8 years old and is not at all up to date (there is 
even Python 2 print commands in it!).
Please open an issue at the Github repository hosting this notebook:
https://github.com/ernestyalumni/Gravite/blob/master/EMsage.ipynb
in order for the author to update it.  

I don't know about any automated way to check that the example notebooks 
are up to date. I am trying to maintain those hosted at
https://github.com/sagemanifolds/SageManifolds
up to date, but the one you are using is not part of them. 
 
By the way, note that since Sage 9.2 an alternative to 
F.exterior_derivative()
is 
diff(F)

Best wishes,

Eric.

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Re: [sage-support] Sagemanifolds error in example notebook

[Dominic Steinitz]

Great thanks very much - I copied from the example - I guess I should have 
checked the manual - I wonder if there is some way of making sure the 
examples are always up to date.

On Wednesday 7 February 2024 at 12:43:47 UTC Vincent Delecroix wrote:

> The error you get indicates that "exterior_der" is not a valid
> operation. Maybe you want "exterior_derivative()"?
>
> On Wed, 7 Feb 2024 at 13:16, Dominic Steinitz  
> wrote:
> >
> > I am in the examples folder trying to run
> >
> > Electromagnetism in Minkowski spacetime [ipynb] (Electromagnetic field 
> 2-form from E and B, Maxwell equations, conserved current, Lorentz force, 
> Poynting vector)
> >
> >
> > but I get the error
> >
> > AttributeError: 'DiffFormFreeModule_with_category.element_class' object 
> has no attribute 'exterior_der'
> > Here's a MWE
> > M = Manifold(4, 'M', latex_name=r'\mathcal{M}', structure='Lorentzian') 
> BL. = M.chart(r"t x y z")
> > var('E_x E_y E_z')
> > dt, dx, dy, dz = BL.coframe()[:]
> > E = E_x * dx + E_y * dy + E_z * dzE.set_name('E')
> > (E.wedge(BL.coframe()[0])).exterior_der()
> >
> > --
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> .
>

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Re: [sage-support] Sagemanifolds error in example notebook

[Vincent Delecroix]

The error you get indicates that "exterior_der" is not a valid
operation. Maybe you want "exterior_derivative()"?

On Wed, 7 Feb 2024 at 13:16, Dominic Steinitz  wrote:
>
> I am in the examples folder trying to run
>
> Electromagnetism in Minkowski spacetime [ipynb] (Electromagnetic field 2-form 
> from E and B, Maxwell equations, conserved current, Lorentz force, Poynting 
> vector)
>
>
> but I get the error
>
> AttributeError: 'DiffFormFreeModule_with_category.element_class' object has 
> no attribute 'exterior_der'
> Here's a MWE
> M = Manifold(4, 'M', latex_name=r'\mathcal{M}', structure='Lorentzian') 
> BL. = M.chart(r"t x y z")
> var('E_x E_y E_z')
> dt, dx, dy, dz = BL.coframe()[:]
> E = E_x * dx + E_y * dy + E_z * dzE.set_name('E')
> (E.wedge(BL.coframe()[0])).exterior_der()
>
> --
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[sage-support] Sagemanifolds error in example notebook

[Dominic Steinitz]

I am in the examples folder trying to run 
   
   - Electromagnetism in Minkowski spacetime 
   

[ipynb 
   
] 
   (Electromagnetic field 2-form from E and B, Maxwell equations, conserved 
   current, Lorentz force, Poynting vector)


but I get the error

AttributeError: 'DiffFormFreeModule_with_category.element_class' object has 
no attribute 'exterior_der'
Here's a MWE
M = Manifold(4, 'M', latex_name=r'\mathcal{M}', structure='Lorentzian') 
BL. = M.chart(r"t x y z") 
var('E_x E_y E_z')
dt, dx, dy, dz = BL.coframe()[:]
E = E_x * dx + E_y * dy + E_z * dzE.set_name('E')
(E.wedge(BL.coframe()[0])).exterior_der()

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