src/AppParCurves/AppParCurves_Gradient_BFGS.gxx

   1 // File:        AppParCurves_Gradient_BFGS.gxx
   2 // Created:     Thu Dec 16 13:09:24 1999
   3 // Author:      Atelier CAS2000
   4 //              <cas@cageox.paris1.matra-dtv.fr>
   5 //-Copyright:    Matra Datavision 1999
   6
   7
   8 // Redefinition de math_BFGS:
   9 // ==========================
  10
  11
  12 AppParCurves_Gradient_BFGS::AppParCurves_Gradient_BFGS(math_MultipleVarFunctionWithGradient& F,
  13                                                        const math_Vector& StartingPoint,
  14                                                        const Standard_Real Tolerance3d,
  15                                                        const Standard_Real Tolerance2d,
  16                                                        const Standard_Real Eps,
  17                                                        const Standard_Integer NbIterations ):
  18        math_BFGS(F, Eps, NbIterations, Eps),
  19        myTol3d(Tolerance3d),
  20        myTol2d(Tolerance2d)
  21 {
  22   Perform(F, StartingPoint);
  23 }
  24
  25 Standard_Boolean AppParCurves_Gradient_BFGS::IsSolutionReached(math_MultipleVarFunctionWithGradient& F) const
  26 {
  27     AppParCurves_ParFunction *F1 = (AppParCurves_ParFunction*) &F;
  28     Standard_Boolean Result, Result2;
  29
  30     Result = (2.0 * fabs(TheMinimum - PreviousMinimum) <=
  31         1.e-10 * (fabs(TheMinimum) + fabs(PreviousMinimum))+1.e-12);
  32     Standard_Real MErr3d = F1->MaxError3d();
  33     Standard_Real MErr2d = F1->MaxError2d();
  34
  35     Result2 = ((MErr3d <= myTol3d) && (MErr2d <= myTol2d));
  36     return (Result || Result2);
  37   }
  38
  39