Re: NEC-LIST: Re: NEC 4.1 Anomaly

At 01:04 PM 3/19/2006, Roy Lewallen wrote:
>I see this with NEC4S compiled with CVF. My guess is that it's an
>accumulation of error. I don't see it with NEC4D, or with EZNEC/4 which
>uses its own double precision helix creation routine even when NEC4S is
>selected to run calculations. If you need to use single precision NEC4, it
>would probably be a good idea to rewrite the helix subroutine in double
>precision.

I'm curious. I run only the double precision NEC4, so I don't have a feel
for the speed difference, but on even a 1GHz laptop (which slows down to
around 200-300 MHz running NEC, for thermal reasons), models run reasonably
fast (as in <1 minute for models with a few hundred segments).

The only really slow model is a 3x3 array of patches with 2000+ segments,
but that's a "go get coffee" run time, even on a fast desktop.

Why run single precision at all?

Jim

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