Re: [Help-gsl] Nonlinear fitting

[Marco Maggi]

Ken O'Brien wrote:
> Here are the relevant functions in the attachment.

You have not posted a full program!  Do you actually want to
perform a weighted fit?  Or have you just copied the example
code?  "expb_fdf()" can just be  a call to "expb_f" followed
by a call  to "expb_df", as in the example  program from the
documentation.  Can you compute the Jacobian matrix J_ij = d
Y_i / d x_j of:

   Y_i = C0 + C1 * cpu_i + C2 * cpu_i ^ r

with respect to x_0 = C0, x_1 = C1, x_2 = C2 and x_3 = r?
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