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David is right , in detail , you can see the code in worldToMap below:

  /**
   * @brief  Given two map coordinates... compute the associated index
   * @param mx The x coordinate
   * @param my The y coordinate
   * @return The associated index
   */
  inline unsigned int getIndex(unsigned int mx, unsigned int my) const
  {
    return my * size_x_ + mx;
  }

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