| 35 | 
  | 
 *                                                                       | 
| 36 | 
  | 
 * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).              | 
| 37 | 
  | 
 * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).           | 
| 38 | 
< | 
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).           | 
| 38 | 
> | 
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).           | 
| 39 | 
  | 
 * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010). | 
| 40 | 
  | 
 * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011). | 
| 41 | 
  | 
 */ | 
| 88 | 
  | 
    } | 
| 89 | 
  | 
     | 
| 90 | 
  | 
    /** | 
| 91 | 
< | 
     * Retunrs reference of the first element of Vector3. | 
| 91 | 
> | 
     * Returns reference of the first element of Vector3. | 
| 92 | 
  | 
     * @return reference of the first element of Vector3 | 
| 93 | 
  | 
     */ | 
| 94 | 
  | 
    inline Real& x() {  return this->data_[0];} | 
| 95 | 
  | 
     | 
| 96 | 
  | 
    /** | 
| 97 | 
< | 
     * Retunrs the first element of Vector3. | 
| 97 | 
> | 
     * Returns the first element of Vector3. | 
| 98 | 
  | 
     * @return  the first element of Vector3 | 
| 99 | 
  | 
     */ | 
| 100 | 
  | 
    inline Real x() const {  return this->data_[0];} | 
| 101 | 
  | 
     | 
| 102 | 
  | 
    /** | 
| 103 | 
< | 
     * Retunrs reference of the second element of Vector3. | 
| 103 | 
> | 
     * Returns reference of the second element of Vector3. | 
| 104 | 
  | 
     * @return reference of the second element of Vector3 | 
| 105 | 
  | 
     */ | 
| 106 | 
  | 
    inline Real& y() {  return this->data_[1];} | 
| 107 | 
  | 
     | 
| 108 | 
  | 
    /** | 
| 109 | 
< | 
     * Retunrs  the second element of Vector3. | 
| 109 | 
> | 
     * Returns  the second element of Vector3. | 
| 110 | 
  | 
     * @return c the second element of Vector3 | 
| 111 | 
  | 
     */ | 
| 112 | 
  | 
    inline Real y() const {  return this->data_[1];} | 
| 113 | 
  | 
     | 
| 114 | 
  | 
    /** | 
| 115 | 
< | 
     * Retunrs reference of the third element of Vector3. | 
| 115 | 
> | 
     * Returns reference of the third element of Vector3. | 
| 116 | 
  | 
     * @return reference of the third element of Vector3 | 
| 117 | 
  | 
     */ | 
| 118 | 
  | 
    inline Real& z() {  return this->data_[2];} | 
| 119 | 
  | 
     | 
| 120 | 
  | 
    /** | 
| 121 | 
< | 
     * Retunrs  the third element of Vector3. | 
| 121 | 
> | 
     * Returns  the third element of Vector3. | 
| 122 | 
  | 
     * @return f the third element of Vector3 | 
| 123 | 
  | 
     */ | 
| 124 | 
  | 
    inline Real z() const {  return this->data_[2];} | 
| 130 | 
  | 
   * @param v1 first vector | 
| 131 | 
  | 
   * @param v2 second vector | 
| 132 | 
  | 
   * @return the cross product  of v1 and v2 | 
| 133 | 
– | 
   * @see #vector::dot | 
| 133 | 
  | 
   */ | 
| 134 | 
  | 
  template<typename Real> | 
| 135 | 
  | 
  inline Vector3<Real> cross( const Vector3<Real>& v1, const Vector3<Real>& v2 ) { |