public RowBuilder floatCol(String name){
  ColumnFloat column=new ColumnFloat(_columns.size(),name,_offset);
  _offset+=column.length();
  _columns.add(column);
  return this;
}

public RowBuilder floatCol ( String name ) { ColumnFloat column = new ColumnFloat ( _columns . size ( ) , name , _offset ) ; _offset += column . length ( ) ; _columns . add ( column ) ; return this ; }
creates a float valued column .
