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  class SelectionManager; | 
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  /** | 
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   * @class SimInfo SimInfo.hpp "brains/SimInfo.hpp"  | 
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   * @brief As one of the heavy weight class of OOPSE, SimInfo | 
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   * One of the major changes in SimInfo class is the data struct. It only maintains a list of molecules. | 
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   * And the Molecule class will maintain all of the concrete objects (atoms, bond, bend, torsions, rigid bodies, | 
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   * cutoff groups, constrains). | 
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   * Another major change is the index. No matter single version or parallel version,  atoms and | 
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   * rigid bodies have both global index and local index. Local index is not important to molecule as well as | 
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   * cutoff group.  | 
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> | 
   * @brief One of the heavy weight classes of OOPSE, SimInfo maintains a list of molecules. | 
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   * The Molecule class maintains all of the concrete objects  | 
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   * (atoms, bond, bend, torsions, rigid bodies, cutoff groups, constrains). | 
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> | 
   * In both the  single and parallel versions,  atoms and | 
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   * rigid bodies have both global and local indices.  The local index is  | 
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   * not relevant to molecules or cutoff groups. | 
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   */ | 
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  class SimInfo { | 
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  public: | 
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 | 
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    /** Returns the number of degrees of freedom */ | 
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    int getNdf() { | 
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      return ndf_; | 
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      return ndf_ - getFdf(); | 
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    } | 
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 | 
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    /** Returns the number of raw degrees of freedom */ | 
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      return ndfTrans_; | 
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    } | 
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 | 
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    /** sets the current number of frozen degrees of freedom */ | 
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    void setFdf(int fdf) { | 
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      fdf_local = fdf; | 
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    } | 
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 | 
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    int getFdf();  | 
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     | 
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    //getNZconstraint and setNZconstraint ruin the coherent of SimInfo class, need refactorying | 
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         | 
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    /** Returns the total number of z-constraint molecules in the system */ | 
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         | 
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    //degress of freedom | 
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    int ndf_;           /**< number of degress of freedom (excludes constraints),  ndf_ is local */ | 
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    int fdf_local;       /**< number of frozen degrees of freedom */ | 
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    int fdf_;            /**< number of frozen degrees of freedom */ | 
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    int ndfRaw_;    /**< number of degress of freedom (includes constraints),  ndfRaw_ is local */ | 
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    int ndfTrans_; /**< number of translation degress of freedom, ndfTrans_ is local */ | 
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    int nZconstraint_; /** number of  z-constraint molecules, nZconstraint_ is global */ |