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# Re: Convergence problem with pure iron?

- To: femm@yahoogroups.com
- Subject: Re: Convergence problem with pure iron?
- From: uwenh@gmx.de
- Date: Tue, 15 May 2001 20:48:37 -0000
- In-reply-to: <3B013504.6D77C3C3@foster-miller.com>
- User-agent: eGroups-EW/0.82

    > Often, you can just plot the BH curve and "eyeball" it to see if it
    looks
    > ok. Unfortunately, because of the scaling of the plot, it is
    difficult to
    > tell whether or not the BH curve is ok. This is actually what is
    going on
    > with the "Pure Iron" curve--the curve fit is messed up in the steep
    initial
    > section, but it's hard to see in the plot. I looked through the
    library, and
    > it appears that the "430 Stainless" entry is also mucked up in a
    similar
    > way--the rest of them appear to be OK.

    All right, I wanted to "eyeball" myself, but I didn't have a Math
    package to get a cubic spline fit done. Luckily I found a set of
    freely
    available functions for Excel on this web site:
    http://www.netrax.net/~jdavita/XlXtrFun/XlXtrFun.htm
    Maybe it's of some interest for others as well.

    Rgds

    Uwe.

- References:
  - Re: [femm] Convergence problem with pure iron?
    - From: David Meeker <dmeeker@foster-miller.com>

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