throw new Exception("Help requested.\n");
}
firstData = firstInput.getStructure();
secondData = secondInput.getStructure();
if (!secondData.equalHeaders(firstData)) {
throw new Exception("Input file formats differ.\n" + secondData.equalHeadersMsg(firstData) + "\n");
}
if (classIndex.length() != 0) {
if (classIndex.equals("first")) {
firstData.setClassIndex(0);
secondData.setClassIndex(0);