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# Re: [femm] Re: Why femm sometimes never finised the calculation ?

- To: femm@yahoogroups.com
- Subject: Re: [femm] Re: Why femm sometimes never finised the calculation ?
- From: David Meeker <dcm3c@earthlink.net>
- Date: Thu, 06 Dec 2001 20:24:40 -0500
- References: <9uopuq+6cge@eGroups.com>
- User-agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:0.9.4) Gecko/20011019 Netscape6/6.2

``
`matthewc_98 wrote:`

> `Dave,`

>     Thank you very much for your advice. You're a real expert
>     on this topic, because you help me to fix the problem that
>     noised me for two weeks. My problem was caused by
>     nonlinear material of initial permeability. After smooth out the
>     curve, there is no problem to execute the software.

> `Thank you in advance,`
> `Matthew`

`I've been meaning to make the program more robust to this situation, but I just haven't gotten around to it yet...The fix probably involves realizing that things aren't converging and choosing the step length in the Newton iteration in a way that forces the error to decrease.`
`Dave.`
``

- References:
  - Re: Why femm sometimes never finised the calculation ?
    - From: "matthewc_98" <matthewc_98@yahoo.com>

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