[Users] [Maintainers] New Tutorial Account Requested

Wed Mar 8 14:59:14 CST 2023

On 3/8/2023 2:13 PM, Enzo Iubini wrote:
> Thank you Steve!
>
> My problem is: the simulation gifs of the Wave Equation and Heat 
> Equation notebooks on the tutorial folder are not showing correctly.

So I just clicked through the heat equation notebook. The cell that ends 
with:

## play animation
from IPython.display import HTML
HTML(anim.to_html5_video())  #playback option 1
#HTML(anim.to_jshtml())       #playback option 2

Played an animation for me. Initially, there is a spike at the center of 
the grid, and it evolves to become flat. (It also printed a deprecation 
warning about the "close_event" function, whatever that is).

Did you click through to this cell or did you stop at the one before? 
Because the one before it just displays a still image.

The WaveEquation also worked for me by just clicking through the cells 
in order.

>
> I'm trying to understand how Cactus works, so I ran every cell in the 
> notebook while looking at the Terminal and seeing how each file is 
> created and its contents.
> The problem comes when I finally run the simulations, which take a while.
This happens in seconds for me.
> So after the running is complete, there's this section called "Extract 
> data from hdf5 files".
> The files exist, as I have previously checked, but the time steps 
> array is actually a [0,0] array in the heat equation, and a very 
> random array in the wave equation.
> In both cases, when plotting the simulations, the solution does not 
> change from the initial condition.
Did you modify the cells from the original tutorial? Because this all 
just worked for me.
>
> I tried to open the data files to see if I could understand what was 
> going on but I'm unable to open these kind of files, and Cactus being 
> a black box leaves me helpless to see where the mistake is coming from.

So I disagree that Cactus is a black box since it is open source and the 
purpose of these tutorials is to show how it works... but it's a very 
big non-black box which can be overwhelming.

I think your problem is the hdf5 files, not Cactus. Hdf5 is a file 
format that Cactus uses. You can open them with commands like h5ls, or 
Python's h5py library (which the notebook provides some examples of usage).

>
> I want to work on the problems at the end of these notebooks, but not 
> correctly seeing the solution makes me think there's something wrong 
> since the beggining, and I have not changed anything else from the 
> initial notebook.

So I'm not 100% sure what's going on, but I suspect you've either not 
clicked far enough or you have modified the notebook. Please check and 
let me know.

--Steve

>
> Has this happened to anyone before?
>
> I'm sorry for the long email, I'm very new to this software and 
> there's so much to learn! :-)
> Thank you in advance.
>
> - Enzo
>
> El mié, 8 mar 2023 a las 14:02, Steven R. Brandt 
> (<sbrandt at cct.lsu.edu>) escribió:
>
>     You've come to the right place. What's the problem?
>
>     --Steve
>
>     On 3/7/2023 7:41 PM, Enzo Iubini wrote:
>>     Hello!
>>     Thank you for approving my tutorial account.
>>
>>     I have a small question. I'm having a bit of trouble with some
>>     tutorial notebooks, in particular the Heat Equation and Wave
>>     Equation notebooks, where the simulations are not running
>>     properly. The question is, who can I contact to get support with
>>     this? I would not want to bug you if this is not your job, but
>>     I'm a little lost and got nobody to ask for help.
>>
>>     Thank you in advance.
>>     Greetings!
>>
>>     Enzo Iubini
>>
>>     El lun, 5 dic 2022 a las 13:12, Steven R. Brandt
>>     (<sbrandt at cct.lsu.edu>) escribió:
>>
>>         Approved. :)
>>
>>         --Steve
>>
>>         On 12/5/2022 9:53 AM, RegistrationBot at einsteintoolkit.org wrote:
>>         > Einstein Toolkit maintainers:
>>         >
>>         > New Tutorial Request:
>>         > Name: http://orcid.org/0000-0001-9327-0832
>>         > Email: egic.enzo at gmail.com
>>         > Organization: ORCID
>>         > Why: Hello!
>>         > My name is Enzo Iubini and I'm doing my Master's degree in
>>         Applied Mathematics. I study at Universidad de Chile, and my
>>         work is about binary black holes. My proffessor has
>>         recommended me to try Einstein toolkit, but I'm having
>>         trouble understanding how to work around it, therefore I'd
>>         really like to have a tutorial account.
>>         > I do not have a homepage.
>>         >
>>         > Thanks in advance!
>>         >
>>         >
>>         > The above user has requested a tutorial account.
>>         >
>>         > Thanks,
>>         > Einstein Toolkit Registration Bot
>>         >
>>         > _______________________________________________
>>         > Maintainers mailing list
>>         > Maintainers at einsteintoolkit.org
>>         > http://lists.einsteintoolkit.org/mailman/listinfo/maintainers
>>
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