Re: Help fitting Exponential curves

*To*: mathgroup at smc.vnet.net*Subject*: [mg28980] Re: [mg28969] Help fitting Exponential curves*From*: Simon Chandler <simon_chandler at agilent.com>*Date*: Thu, 24 May 2001 04:06:57 -0400 (EDT)*References*: <200105230554.BAA01366@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Todd, > I am looking to fit some exponential curves to a form of > P=Po*e^(-K*t) where K and Po are values I need. This equation requires some method of non-linear fitting. "Non-linear" in the sense that the function is non-linear with respect to its parameters. Fit[] only works for a model that is a linear combination of the basis functions. There is a non-linear fitting routine in the Statistics`NonlinearFit` package. I suggest you read the manual to the Standard Add-on Packages. An even better way of doing non-linear fitting is provided by the Experimental Data Analyst package. See http://www.wolfram.com/products/applications/eda/ I thoroughly recommend this package. If you want to read about non-linear fitting methods have a look in the classic Numerical Recipies book. See http://www.nr.com/ Hope that help, Simon

**References**:**Help fitting Exponential curves***From:*Todd <tcs3a@virginia.edu>