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Re: NonlinearRegress of user functions

• To: mathgroup at smc.vnet.net
• Subject: [mg91534] Re: NonlinearRegress of user functions
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Mon, 25 Aug 2008 06:57:04 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <g8tsnu$nte$1@smc.vnet.net>

Ngoc Anh Lai wrote:

> I have experimental data set of (Texp, pexp, rhoexp). With each value of
> Texp, I will calculate pcal and rhocal by using functions pcal = psT[T,
> A, B, C, D, E]  and rhocal = rhoT[T, A, B, C, D, E]. Parameters A, B, C,
> D, E of the functions psT and rhoT will be found by Minimization of 

<snip>

FWIW, though I cannot tell for sure whether this is the source of your 
problems, note that, in general, it is a very bad idea to use single 
capital letters as names of variables because many of them have already 
been attributed some predefined meanings (every Mathematica built-in 
command begins with a capital letter). For instance, D is the 
differential operator, E is the base for natural logarithms. You should 
use longer names and/or start them with lowercase letters.

Regards,
-- Jean-Marc