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# Re: problems with FEMM-4

- To: femm@yahoogroups.com
- Subject: Re: problems with FEMM-4
- From: "David Meeker" <dmeeker@ieee.org>
- Date: Fri, 26 Sep 2003 13:35:57 -0000
- In-reply-to: <bl079h+drpt@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "ahmad_m_eid" <ahmad_m_eid@y...> wrote:
    > dear all
    > I used femm 3.3 before, when I installed femm 4.0 there are problems
    > with me. Befroe in femm 3.3 I write two separate txt file for pre-
    > postrocessor because I want to move the magnet and each time calculate
    > emf and force. Now, in femm 4.0 when I run the program it doesn't
    > write to output files to calculate emf and force.

    I had to change the Lua interface somewhat to accommodate having the
    pre- and post-processor and multiple problem types addressed all by a
    single instance of Lua.

    However, having everything inside one Lua instance means having to
    redo most scripts from version 3.3. Since there is no separate
    postprocessor, there are no separate pre- and post-processor
    scripts--it's all in one script. In addition, commands to the
    magnetics preprocessor are prefixed by mi_, to the magnetic
    postprocessor by mo_, and electrostatic pre- and post-processors by
    ei_ and eo_ respectively.

    > * Is there Openfemmfile in femm 4.0? I search about it in the manual,
    > but I didn't find it.

    This has been replaced by open("filename") -- this command is used to
    open any .fem, .ans, .fee, or .res file.

    > * there's no exitpost() in new version, or runpost()?? to run a
    > postprocessor txt file.
    >
    > * I can't understand mi_loadsolution(), mi_setfocus()

    To close a postprocessor window in 4.0, you use mo_close()
    To load up a solution (which is sort of equivalent to runpost,
    although it's just loading the solution into another window, rather
    than running an entirely different program), you use mi_loadsolution()
    If there are multiple input geometries that you are editing with Lua
    at the same time (which is probably not usually the case), you can
    switch between these input filed using mi_setfocus()

    > * I want to move the magnet and calculate each time force and emf.
    > I did that in femm 3.3 before.

    Remember also that 4.0 is still a really early development release.
    If you have a lot of stuff written for 3.3, I would really advise
    redoing it all to run right in 4.0 just yet.

    Dave
    --
    David Meeker
    dmeeker@ieee.org

- References:
  - problems with FEMM-4
    - From: "ahmad_m_eid" <ahmad_m_eid@yahoo.com>

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