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