TSSP: List Archives

From: Paul
Date: Fri, 05 Jan 2001 10:46:30 +0000
Subject: Re: [TSSP] Virtual Secondary Database

Terry,

I cobbled together a little curve fitter - gradient descent with
a dash of monte carlo, and left it running on a spare PC overnight.

So far its come up with

 y = m * x + c

where

 m = 0.73261
 c = 0.6040

and

 x =   (k1 + hd)^k2 * 
       (k3 + b)^k4  * 
       (k5 + td)^k6 * 
       (k7 + awg)^k8 * 
       (k9 + h)^k10 * 
       (k11 + sr)^k12 * 
       (k13 + tb)^k14

in which

      k1 = 0.5836
      k2 = -0.4048
      k3 = 0.0423
      k4 = 0.1519
      k5 = -0.9487
      k6 = 0.1143
      k7 = 3.1508
      k8 = 0.0096
      k9 = 0.0721
      k10 = 0.0039
      k11 = 0.6325
      k12 = -0.0070
      k13 = 0.0793
      k14 = 0.0259

and the variables hd,b,td,awg,h,sr,tb are the seven configuration
space axes, with the modification:

   if (td is zero) then set td = 1.0 and set tb = 0.0

The computed value y is approximately equal to Lfac
where Lfac = les/ldc, to within an RMS deviation of 1.4% over
1200 vsd records.

Cheers,
--
Paul Nicholson,
Manchester, UK.
--


Maintainer Paul Nicholson, paul@abelian.demon.co.uk.