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# RE: [femm] Re: Lua sample of line integral

- To: <femm@yahoogroups.com>
- Subject: RE: [femm] Re: Lua sample of line integral
- From: "Robin Cornelius" <robin.cornelius@hirst-magnetics.com>
- Date: Mon, 20 Aug 2001 17:26:48 +0100
- Importance: Normal
- In-reply-to: <253D3D5DE6D6F04092A36D739A8F2976013B04@dvrfile.dvrhome.com>
- Reply-to: <robin.cornelius@hirst-magnetics.com>

    If your feeling brave then give the 3.1 patch a try it has a way of passing
    variables to the post processor
    (available from the femm files section)

    the new version of run_post accepts variables as so

    in the pre-processor script try

    run_post("c:\\my-lua-script.lua","-lua-var=filename=myfilename","-lua-var=ms
    g=hello-world")

    then in the post processor

    try
    _ALERT(msg)
    _ALERT(filename)

    and you will see hello world for msg and myfilename for filename

    You can use these variables any where you would normally use variables in an
    lua script !!

    All variables are passed as strings so you will have to use internal
    conversion routines to get numbers out

    Hopefully this will make peoples lives a lot easier than using temp files to
    pass data around
    (There is no way of passing data back the other way however without using
    temp files)

    Regards

    Robin Cornelius

    -----Original Message-----
    From:
    sentto-1333690-616-998317264-robin.cornelius=hirst-magnetics.com@returns
    .onelist.com
    [mailto:sentto-1333690-616-998317264-robin.cornelius=hirst-magnetics.com
    @returns.onelist.com]On Behalf Of Carl Kopin
    Sent: 20 August 2001 15:22
    To: femm@yahoogroups.com
    Subject: RE: [femm] Re: Lua sample of line integral

    Hi Jim,

    Try this:

    In the preprocessor create your file like this:

    handle=openfile('mydata.txt','w')
    write(handle,'my comment 1\n', 'my comment
    2\n',data1,'\n',data2[,'\n',data3[,...]])
    closefile(handle)

    In the postprocessor read your file as follows:

    handle=openfile('mydata.txt','r')
    line1,line2,d1,d2=read(handle,'*l','*n','*n')
    close(handle)

    Writing the mydata.txt file is simple, the trick is to properly read it.
    If you ad a comment line or to in the beginning of your file, you have
    to read it it/them first before your data, that's why you add '*l' ( the
    "l" is a lower case L, which means to read whole line) in the beginning
    one for each line, and then you add the '*n' (to read numbers) as many
    times as needed to read your data. You don't need to read the whole
    file, but you must read it from the very beginning to the last point of
    your interest. You do not need your comment lines in your postprocessor,
    but you must read them to a "junk" var in order to access the data part.
    To send/read characters, in the preprocessor use the form of 'my
    char\n', in the postprocessor use '*w' that stands for word. You can use
    "new line" (\n) or tab (\t) as your delimiters. (Are spaces OK, too? I
    am not sure, did not try.)

    I think, this will help you (and possibly others, too).
    Other comments are welcomed.
    Carl

    -----Original Message-----
    From: jim271@hotmail.com [mailto:jim271@hotmail.com]
    Sent:	Sunday, August 19, 2001 08:23
    To:	femm@yahoogroups.com
    Subject:	[femm] Re: Lua sample of line integral

    Dave,

    Thank you for the example. This is very helpful.

    Dave: " As far as getting information from one iteration to the next,
    or from the preprocessor to the postprocessor, perhaps the easiest
    way to do this is via the use of a temporary file. I have used a
    temporary file in this example to send the current plunger position
    to the postprocessor so that it can write this piece of info to the
    output file. "

    I can get the post processing file to read one variable that is
    passed by the main script file, but I can't seem to get it to read
    two or more data values from the same line of the data file.

    Can someone please show an example of reading multiple variables from
    a file by the post processor?

    -- Jim

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- Follow-Ups:
  - RE: [femm] Re: Lua sample of line integral
    - From: Keith Gregory <k.gregory@lboro.ac.uk>

- References:
  - RE: [femm] Re: Lua sample of line integral
    - From: "Carl Kopin" <ckopin@davinciresearch.com>

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