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? -- "Now feel the funk blast!" Rage Against the Machine - "Calm like a bomb"
