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NonlinearFit

• To: mathgroup at smc.vnet.net
• Subject: [mg42109] NonlinearFit
• From: civnrn at hotmail.com (Rees)
• Date: Thu, 19 Jun 2003 03:59:38 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

Please could someone assist me in curve fitting.

I have the following x,y data

data = {{0.1,0.113387476}, {0.2, 0.194633152}, {0.3, 
      0.252848224}, {0.4, 0.294561145}, {0.5, 
      0.324449759}, {0.6, 0.345865887}, {0.7, 
      0.361211213}, {0.8, 0.37220662}, {0.9, 
      0.380085173}, {1.0, 0.385730403}};

Now I wish to fit an exponential curve of the form below to it:

c*[1-Exp(-3x/a]

where c and a are parameters to be determined.

I tried the following but it doesn't work:

NonlinearFit[data, c*(1 - Exp(-3*x1/a)), {x1}, {c, a}]


Please advise.

Thanks is advance

Rees

• Follow-Ups:
  • Re: NonlinearFit
    • From: "German Buitrago A." <gerbual@col2.telecom.com.co>