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# Re: [femm] Axi-symmetric arcs for FEMMVIEW

- To: femm@yahoogroups.com
- Subject: Re: [femm] Axi-symmetric arcs for FEMMVIEW
- From: Dave Squires <djsquires@plix.com>
- Date: Tue, 21 May 2002 09:03:42 -0700
- References: <5.1.0.14.0.20020521075228.00a9ea20@staff-mailin.lboro.ac.uk> <3CEA5468.1090501@ieee.org>

    David Meeker wrote:

    > Keith Gregory wrote:
    >
    > > Daves,
    > >
    > > Great minds? I've been trying to write a lua script to make circular
    > > contours using little straight line segments. It looks like it might be
    > > possible but it's not that easy.
    >
    > I probably should put in this functionality, since it would basically be
    > just implementing the code to make a circular contour out of little
    > straight line segments, rather than making users do it themselves via
    > lua. Call me lazy.
    >
    > > I want it for a different reason though,
    > > because I want to find the total flux crossing an arbitrary circular arc
    > > where it is not possible to include an arc in the geometry.
    > >
    > > Keith.
    >
    > Regardless of the contour, the B.n integral is evaluated by taking the
    > difference of the value of A at the endpoints of the contour. If I
    > understand what you are trying to do correctly, there's no need for you
    > to actually draw your arc--just evaluate A at the endponts and take the
    > difference to get the total flux crossing your arc.

    But don't you need to know the path of the arc? If you have only end
    points the path could be anything, straight line, arc, polygon path.
    Who knows? If there is no defined contour what is the point of integrating
    over it? I must be missing something....a hidden assumption.

    I still think it should be fairly trivial to use the same arc code block in
    FEMM and apply it to circular contours in FEMMVIEW. After all
    the code is already written, just copy it over and use it.

    DRS

    > Dave.
    > --
    > David Meeker <http://femm.berlios.de/dmeeker>
    >
    >
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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    - From: David Meeker <dmeeker@ieee.org>
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- References:
  - Re: [femm] Axi-symmetric arcs for FEMMVIEW
    - From: Keith Gregory <k.gregory@lboro.ac.uk>
  - Re: [femm] Axi-symmetric arcs for FEMMVIEW
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