Re: NonlinearFit
- To: mathgroup at smc.vnet.net
- Subject: [mg42129] Re: NonlinearFit
- From: bobhanlon at aol.com (Bob Hanlon)
- Date: Fri, 20 Jun 2003 04:57:29 -0400 (EDT)
- References: <bcrrkf$hp6$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Needs["Statistics`NonlinearFit`"];
data={{0.1,0.113387476},{0.2,0.194633152},
{0.3,0.252848224},{0.4,0.294561145},
{0.5,0.324449759},{0.6,0.345865887},
{0.7,0.361211213},{0.8,0.37220662},
{0.9,0.380085173},{1.0,0.385730403}};
Must use [ ] with Exp
NonlinearFit[data,c*(1-Exp[-3*x1/a]),{x1},{c,a}]
0.40000000043347517*(1 - E^(-3.33333333010406*x1))
Bob Hanlon
In article <bcrrkf$hp6$1 at smc.vnet.net>, civnrn at hotmail.com (Rees) wrote:
<< Subject: NonlinearFit
From: civnrn at hotmail.com (Rees)
To: mathgroup at smc.vnet.net
Date: Thu, 19 Jun 2003 08:18:23 +0000 (UTC)
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}]