# sc::PointGroup Class Reference

The PointGroup class is really a place holder for a CharacterTable. More...

`#include <pointgrp.h>`

Inheritance diagram for sc::PointGroup:

List of all members.

## Public Member Functions

| PointGroup (const char *)
| This constructor takes a string containing the Schoenflies symbol of the point group as its only argument.
| PointGroup (const char *, SymmetryOperation &)
| Like the above, but this constructor also takes a frame of reference as an argument.
| PointGroup (const char *, SymmetryOperation &, const SCVector3 &)
| Like the above, but this constructor also takes a point of origin as an argument.
| PointGroup (const Ref< KeyVal > &)
| The PointGroup KeyVal constructor looks for three keywords: symmetry, symmetry_frame, and origin.
| PointGroup (StateIn &)
| PointGroup (const PointGroup &)
| PointGroup (const Ref< PointGroup > &)
PointGroup & | operator= (const PointGroup &)
int | equiv (const Ref< PointGroup > &, double tol=1.0e-6) const
| Returns 1 if the point groups are equivalent, 0 otherwise.
CharacterTable | char_table () const
| Returns the CharacterTable for this point group.
const char * | symbol () const
| Returns the Schoenflies symbol for this point group.
SymmetryOperation & | symm_frame ()
| Returns the frame of reference for this point group.
const SymmetryOperation & | symm_frame () const
| A const version of the above.
SCVector3 & | origin ()
| Returns the origin of the symmetry frame.
const SCVector3 & | origin () const
void | set_symbol (const char *)
| Sets (or resets) the Schoenflies symbol.
void | save_data_state (StateOut &so)
| Save the base classes (with save_data_state) and the members in the same order that the StateIn CTOR initializes them.
void | print (std::ostream &o=ExEnv::out0()) const
| Print the object.

## Detailed Description

The PointGroup class is really a place holder for a CharacterTable.

It contains a string representation of the Schoenflies symbol of a point group, a frame of reference for the symmetry operation transformation matrices, and a point of origin. The origin is not respected by the symmetry operations, so if you want to use a point group with a nonzero origin, first translate all your coordinates to the origin and then set the origin to zero.

## Constructor & Destructor Documentation

sc::PointGroup::PointGroup | ( | const char * |  | ) |

This constructor takes a string containing the Schoenflies symbol of the point group as its only argument.

sc::PointGroup::PointGroup | ( | const char * | ,
|  | SymmetryOperation & |
| ) |  |

Like the above, but this constructor also takes a frame of reference as an argument.

sc::PointGroup::PointGroup | ( | const char * | ,
|  | SymmetryOperation & | ,
|  | const SCVector3 & |
| ) |  |

Like the above, but this constructor also takes a point of origin as an argument.

sc::PointGroup::PointGroup | ( | const Ref< KeyVal > & |  | ) |

The PointGroup KeyVal constructor looks for three keywords: symmetry, symmetry_frame, and origin.

symmetry is a string containing the Schoenflies symbol of the point group. origin is an array of doubles which gives the x, y, and z coordinates of the origin of the symmetry frame. symmetry_frame is a 3 by 3 array of arrays of doubles which specify the principal axes for the transformation matrices as a unitary rotation.

For example, a simple input which will use the default origin and symmetry_frame ((0,0,0) and the unit matrix, respectively), might look like this:

           pointgrp<PointGroup>: (
             symmetry = "c2v"
           )

By default, the principal rotation axis is taken to be the z axis. If you already have a set of coordinates which assume that the rotation axis is the x axis, then you'll have to rotate your frame of reference with symmetry_frame:

           pointgrp<PointGroup>: (
             symmetry = "c2v"
             symmetry_frame = [
               [ 0 0 1 ]
               [ 0 1 0 ]
               [ 1 0 0 ]
             ]
           )

## Member Function Documentation

void sc::PointGroup::save_data_state | ( | StateOut & |  | ) | `[virtual]`

Save the base classes (with save_data_state) and the members in the same order that the StateIn CTOR initializes them.

This must be implemented by the derived class if the class has data.

Reimplemented from sc::SavableState.

The documentation for this class was generated from the following file:

- pointgrp.h