code: public void set(String value, int idx)
      {
          int rowOffset = getM();
          for ( int i = 0; i < getN(); i++ )
          {
          	if ( i < value.length())
          	{
  
          		setChar( value.charAt(i), idx + (rowOffset * i));
          	}
          	else 
          	{
          		setChar(' ',  idx + (rowOffset * i));
          	}
          }
      }
docs: Set one row, specifying the row.
  
  @param value
  @param idx