Derivatives of power function.
procedure PowerDeriv(RegressFun: TRegressFun; X: double; Y: double; Const Pars: Array of double; const Grad: TVec);
Calculates the derivatives of the power function at point (X,Y) with respect to the regression parameters Pars. The results are returned in Grad vector. Grad.Values[I] contains the derivative with respect to the I-th parameter. The Length and Complex properties of the Grad vector are adjusted automatically.
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