need a curve fitting package

Bernard Heymann bheymann at
Wed Feb 16 11:12:22 EST 1994

In article <1994Feb15.030258.13398 at>, johnk at
(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
> 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

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