/** RK record is a slightly smaller alternative to NumberRecord POI likes NumberRecord better */
  public static NumberRecord convertToNumberRecord(RKRecord rk) {
    NumberRecord num = new NumberRecord();

    num.setColumn(rk.getColumn());
    num.setRow(rk.getRow());
    num.setXFIndex(rk.getXFIndex());
    num.setValue(rk.getRKNumber());
    return num;
  }
  /** Converts a {@link MulRKRecord} into an equivalent array of {@link NumberRecord}s */
  public static NumberRecord[] convertRKRecords(MulRKRecord mrk) {
    NumberRecord[] mulRecs = new NumberRecord[mrk.getNumColumns()];
    for (int k = 0; k < mrk.getNumColumns(); k++) {
      NumberRecord nr = new NumberRecord();

      nr.setColumn((short) (k + mrk.getFirstColumn()));
      nr.setRow(mrk.getRow());
      nr.setXFIndex(mrk.getXFAt(k));
      nr.setValue(mrk.getRKNumberAt(k));
      mulRecs[k] = nr;
    }
    return mulRecs;
  }