Gompertz curve

[salvomic]

(03-30-2015 07:50 PM)Han Wrote:  For this, you could create a system of equations resulting from substituting each pair of X and Y values into the general equation. Then use the generalized Newton's method to determine the least-squares fit. Snorre implemented such a function here:

http://www.hpmuseum.org/forum/thread-455.html#pid24491

thank you Han,
I'm reading the post with the Snorre's method...
but Snorre wrote: «Usage: newton( [f1(x1,...,xn), ..., fm(x1,...,xn)], [x1,...,xn], [xinit1,...,xinitn], thf, thd, kmax )
Prints out the current values of |f(x)| and |d|. Returns x=[x1,...,xn].»
Now, in my case, how to put as xinit1..., thf, thd and kmax?

I tried to use also Solve with 3 equations like you suggest, but perhaps isn't the right method...