setFillWithMissing(Utils.getFlag('M', options));
setFillWithMissing(!Utils.getFlag('M', options));
  public void setOptions(String[] options) throws Exception {    String copyList = Utils.getOption('R', options);    if (copyList.length() != 0) {      setAttributeIndices(copyList);    } else {      setAttributeIndices("");    }        setInvertSelection(Utils.getFlag('V', options));    setFillWithMissing(Utils.getFlag('M', options));        String instanceRange = Utils.getOption('I', options);    if (instanceRange.length() != 0) {      setInstanceRange(Integer.parseInt(instanceRange));    } else {      setInstanceRange(-1);    }    if (getInputFormat() != null) {      setInputFormat(getInputFormat());    }  }