class HGeomVector: public TObject

_HADES_CLASS_DESCRIPTION


 HGeomVector

 This class defines a vector with 3 Double_t components.
 Instantiations of this class are e.g geometry points and
 translation vectors in the geometry transformations.

 All functions and operators are defined inline.

 Constructors:
   HGeomVector(Double_t dx=0,Double_t dy=0,Double_t dz=0)
   HGeomVector(const HGeomVector& v)

 Access to the components:
   void setVector(const Double_t* a);
   void setX(const Double_t a)
   void setY(const Double_t a)
   void setZ(const Double_t a)
   Double_t getX() const
   Double_t getY() const
   Double_t getZ() const
   Double_t operator() (const Int_t i) const;

 Check for the size of all components:
   Bool_t operator < (const Double_t a)
   Bool_t operator <= (const Double_t a)
   Bool_t operator > (const Double_t a)
   Bool_t operator >= (const Double_t a)

 Check for equality/inequality;
   Bool_t operator == (const HGeomVector& v) const
   Bool_t operator != (const HGeomVector& v) const

 Addition/Substraction of a vector;
   HGeomVector& operator += (const Double_t a)
   HGeomVector& operator -= (const Double_t a)

 Addition/Substraction of two vectors;
   HGeomVector operator + (const HGeomVector& v) const
   HGeomVector operator - (const HGeomVector& v) const

 Multiplication/Division of each components with/by a factor
   HGeomVector& operator *= (const Double_t a)
   HGeomVector& operator /= (const Double_t a)


 HGeomVector operator - () const
      changes the sign of all components

 HGeomVector& operator = (const HGeomVector& v)
      assignment

 HGeomVector& abs()
      builds absolute value of each components

 Double_t scalarProduct(const HGeomVector& v) const;
      returns the scalar product

 HGeomVector vectorProduct(const HGeomVector& v) const;
      returns the vector product

 Double_t length() const {return sqrt(x*x+y*y+z*z);}
      returns the length

  void clear()
      sets all components to 0.0

 void print()
      prints the components

 void round(Int_t n)
      rounds all components to a precision with n digits

 friend ostream& operator << (ostream& put,const HGeomVector& v);
      output to stream

 friend istream& operator >> (istream& get,HGeomVector& v);
      input from stream