need a curve fitting package

John Kuszewski johnk at spasm.niddk.nih.gov
Mon Feb 14 21:37:42 EST 1994


I'm looking for a curve-fitting package to do a specific
problem in chemical kinetics.  (Sorry for the long 

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.


John Kuszewski
johnk at spasm.niddk.nih.gov
I'm not an idiot, but I play one on USENET.

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