Re: Curve-fitting/data analysis question...
- To: mathgroup at smc.vnet.net
- Subject: [mg73324] Re: Curve-fitting/data analysis question...
- From: dh <dh at metrohm.ch>
- Date: Mon, 12 Feb 2007 05:03:42 -0500 (EST)
- References: <eqmcfh$bdv$1@smc.vnet.net>
Hi noname,
here is an example:
fun = x1 Exp[-x3(x - x2) Boole[x > x2]];
res = FindFit[d, fun, {x1, x2, x3}, x]
funr = fun /. res;
Plot[funr, {x, 0, 2}]
Daniel
sherifffruitfly wrote:
> Hi all,
>
> I've got some data that is approximately constant, c, over an
> interval, and then drops off like -(a exp(b x)).
>
> How can I determine when the constant part ends, and the negative
> exponential begins in Mathematica? I can eyeball it on a graph, but I'd much
> prefer to have a principled Mathematica routine settle the question. Once
> that's settled, it should be straightforward to determine the
> exponential's parameters via some curve-fitting routine or other.
>
> Thanks for any suggestions,
>
> cdj
>
>