[18721] in s-news-athena
Re: [S] nls( ) singular gradient matrix
daemon@ATHENA.MIT.EDU (ROS Mathieu)
Fri Jul 23 05:04:26 1999
Date: Fri, 23 Jul 1999 10:58:44 +0200 (MET)
From: ROS Mathieu <mim78@cict.fr>
To: "E. Conrad Lamon III" <eclamon@unix1.sncc.lsu.edu>
Cc: S-news@wubios.wustl.edu
In-Reply-To: <9907221823.AA66157@unix1.sncc.lsu.edu>
Message-Id: <Pine.SGI.3.95.990723105408.1816C-100000@ondine.cict.fr>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Thu, 22 Jul 1999, E. Conrad Lamon III wrote:
>
> While trying to fit a nonlinear model using nls( ), I get an error message
> that says I have a singular gradient matrix. I am not sure what causes
> this problem. Should I try different initial values of the parameters, or
> is the problem something else?
yes, you have to put different initial values, but I'd like someone who
'knows' to tell me why this message appears when the initial values
are not close enough to the 'real' ones ?
thanks,
Mathieu
-------------------------------------------------------
Mathieu Ros
mathieuros@bigfoot.com
Universite Paul Sabatier, Toulouse.
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