need a curve fitting package

[Bernard Heymann]

In article <1994Feb15.030258.13398 at cs.yale.edu>, johnk at spasm.niddk.nih.gov
(John Kuszewski) wrote:

> Hi,
> 
> I'm looking for a curve-fitting package to do a specific
> problem in chemical kinetics.  (Sorry for the long 
> description)
> 
> The function to be fitted is 
> 
> I = exp(-kf1 * tf) * (kex/(kex + kf2)) *
>     (1 - exp( -(kf2 + kex)* tex))
> 
> kex is a known constant.
> I, tf, and tex are known variables.
> 
> I need to optimize values of kf1 and kf2 against
> sets of several (I, tf, tex) values.
> 
> Does anyone know of a program that'll do this sort 
> of fit? Nothing I have (facsimilie, Kalidegraph, 
> Mathematica) can do it.  I'd prefer something for 
> a Sun or Mac that I can get for free.
> 
> Thanks!
> 
> -- 
> John Kuszewski
> johnk at spasm.niddk.nih.gov
> I'm not an idiot, but I play one on USENET.

Why didn't it work in Kaleidagraph? You should have been able to do it with
the "General" curve fitting option, plugging your own equation in.

-- 
Bernard Heymann
bheymann at bragg.bio.purdue.edu