[18843] in s-news-athena
[S] nls() fails in a loop
daemon@ATHENA.MIT.EDU (ROS Mathieu)
Wed Aug 4 03:20:11 1999
Date: Wed, 4 Aug 1999 09:14:20 +0200 (MET)
From: ROS Mathieu <mim78@cict.fr>
To: s-news@wubios.wustl.edu
Message-Id: <Pine.SGI.3.95.990804090248.12601A-100000@ondine.cict.fr>
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hello Splus users,
I'm using nls() in a cross-validation loop (no way to avoid it now...)
with 180 iterations but with my initial values
(start(a=-50,b=10,c=-0,009)) it stops after some iterations
with a 'step factor reduced below minimum' error.
How can I handle this problem without entering new starting points at each
step ?
any help will be appreciated
Mathieu
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Mathieu Ros
mathieuros@bigfoot.com
DESS ingenierie mathematique (biostatistiques)
Universite Joseph Fourier, Grenoble
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La prevision est difficile, surtout quand elle concerne l'avenir
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