Re: Help coding some math i have little understanding of

Thank you for looking into this. I am in the process of working thought the referenced paper by frank Haber from 1974. It is actually good at mentioning the single steps of the math.

But apart from the juggling with terms of the bessel functions, I notice that I need an introduction into *coding* with bessel functions. E.g.: For infinte sums, do I need to iterate over the orders of the Bessel functions and add them up until I am satisfied with my accuracy? It seems to be an unpopular topic and the ones that know might find it obvious and dont blog or youtube about it. So my problem starts out rather basic. most likely more come once i understand more - such is the nature of learning 😊

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Von: SciPy-User <[email protected]> im Auftrag von David Mikolas <[email protected]>
Gesendet: Samstag, 5. Dezember 2020 04:13:49
An: SciPy Users List
Betreff: Re: [SciPy-User] Help coding some math i have little understanding of

Not the same paper but looks pretty similar, both links seem to show the same paper.

https://www.ipen.br/biblioteca/cd/ieee/1999/Proceed/00465.pdf
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=667734&tag=1

It's an infinite series solution and with Br and Bphi one can construct the whole 3D vector field because Bz is almost the same as Bphi in this case.

In addition to here, you could also consider posting an answer in Electronics Stack Exchange, but have a look around first, questions need to be supported with all links, you should mention python and explain how far you've gotten and where you're stuck.




On Sat, Dec 5, 2020 at 6:17 AM Robert Kern <[email protected]<mailto:[email protected]>> wrote:
On Wed, Dec 2, 2020 at 4:45 PM Schuldei, Andreas <[email protected]<mailto:[email protected]>> wrote:

I want to 3d plot the magnetic field of a twisted three phase cable, and found a paper giving the analytical solution of the field like <https://imgur.com/a/WeNuveE> this<https://imgur.com/a/WeNuveE#9aelprK>.

There are more details in the paper, of course. Now I dont feel confident with this kind of math. Where can i find someone willing to help me with this? Its research in university, no coorporation involved. I would need help writing code representing these equations in python, calculating the field`s vecors in one point r, phi. I dont ask that you do the work for me, I am not dense either. its just that i dont even know where to start with this math.


Who ever wants to have a look at the whole paper for further details, it is <https://drive.google.com/file/d/1CuXA0Elgw1RsjzLpO7YQ9gDgF41_ToHT/view?usp=sharing> <https://drive.google.com/file/d/1CuXA0Elgw1RsjzLpO7YQ9gDgF41_ToHT/view?usp=sharing> .

Hi Andreas,

The link to the whole paper didn't make it through. We would need to see that for enough context to help. Spherical coordinates have an overabundance of notational conventions, so we'd need to see the whole text to see what they intended.

--
Robert Kern
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