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# Re: number of points in material defintion

- To: femm@yahoogroups.com
- Subject: Re: number of points in material defintion
- From: "David Meeker <dmeeker@ieee.org>" <dmeeker@ieee.org>
- Date: Wed, 05 Feb 2003 15:07:53 -0000
- In-reply-to: <004b01c2cc6a$a05acc60$55755142@robertmacy>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "Robert Macy" <macy@c...> wrote:
    > I took points from manufacturer's data curve. When femm
    > plotted the data, the curve did not follow the data points.
    >
    > Yet, the original data was monotonic and "made sense". Please explain.
    >
    > - Robert -

    Even when you enter in a lot of data points, your selection of points
    could be such that the program can't fit a "good" cubic spline through
    the points. The program fits a cubic spline and then checks if there
    are any extremas anywhere in the fit, which is the definition of a
    "bad" fit. If there are any extremas, the program smooths the entered
    data points using a three-point moving average algorithm. The process
    is repeated until a "good" fit is obtained.

    Dave.
    --
    David Meeker
    http://femm.berlios.de/dmeeker

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