"the matrix format of the input matrix",
true, "STRING", "Required");
options.addOption('o', "ouputFormat",
"the matrix format of the output matrix",
true, "STRING", "Required");
options.parseOptions(args);
if (options.numPositionalArgs() != 2 ||
!options.hasOption('i') || !options.hasOption('o')) {
System.out.println(
"usage: java MatrixConverter [options] <int.mat> <out.mat>\n" +