TMtxNonLinReg.RegressFunction Property

Summary

Defines the regression function of several regression parameters.

Declaration

Property RegressFunction: TRegressFun read FRegressFunction write SetRegressFunction;

Description

Defines the regression function of several regression parameters B and independent variable X.

See Also
DeriveProcedure

Example 1

In the following example we define general polynomial of second degree (three parameters) and also the procedure for derivatives:

      // y=b0*x*x + b1*x + b2 i.e. parabola
      function SimpleParabola(B: Array of TSample; X: TSample): TSample;
      begin
        Result := b[0]*Sqr(x) + b[1]*x + b[2];
      end;
      // procedure for derivatives
      procedure SimplePabolaDeriv(RegressFun: TRegressFun; X, Y: TSample; Pars: Array of TSample; Grad: TVec);
      begin
        Grad[0] := Sqr(x);
        Grad[1] := x;
        Grad[2] := 1;
      end;
      begin
        // ...
        MtxNonLinReg1.RegressFunction := SimpleParabola;
        MtxNonLinReg1.DeriveProcedure := SimpleParabolaDeriv;
      end;