public ArrayAnimator(String group,String field){
  super(group);
  m_field=field;
  m_start=PrefuseLib.getStartField(field);
  m_end=PrefuseLib.getEndField(field);
}

public ArrayAnimator ( String group , String field ) { super ( group ) ; m_field = field ; m_start = PrefuseLib . getStartField ( field ) ; m_end = PrefuseLib . getEndField ( field ) ; }
create a new arrayanimator that processes the given data group and interpolates arrays in the given data field .
