Re: curve fitting question

*To*: mathgroup at smc.vnet.net*Subject*: [mg115430] Re: curve fitting question*From*: Peter Pein <petsie at dordos.net>*Date*: Tue, 11 Jan 2011 00:32:47 -0500 (EST)*References*: <igecqn$cqe$1@smc.vnet.net>

On 10.01.2011 08:34, Michael B. Heaney wrote: > Hi, > > I have data in (x,y) pairs. I have an equation: > > y= a +b (Exp[40*(x + c*y)/d] - 1) - (x +c*y)/e > > where a,b,c,d, and e are fitting parameters. > > Note that this equation cannot be put in the form y=f(x). > > How do I fit this equation to my x,y data? > > Thanks, > > Michael > > I guess you did not try f[x_] = Collect[ y /. First@ Solve[y == a + b (Exp[40*(x + c*y)/d] - 1) - (x + c*y)/e, y], d, Simplify] ? Peter