def subset_data(options):
    """Subset the data.

    :param options: the options.

    :type options: argparse.Namespace

    Subset the data using either ``--exclude`` or ``--extract``for markers or
    ``--remove`` or ``keep`` for samples.

    """
    # The plink command
    plinkCommand = ["plink", "--noweb"]

    # The input file prefix
    if options.is_bfile:
        plinkCommand += ["--bfile", options.ifile, "--make-bed"]
    elif options.is_tfile:
        plinkCommand += ["--tfile", options.ifile, "--recode", "--transpose",
                         "--tab"]
    elif options.is_file:
        plinkCommand += ["--file", options.ifile, "--recode", "--tab"]

    # The subset command for SNPs
    if options.exclude is not None:
        plinkCommand += ["--exclude", options.exclude]
    elif options.extract is not None:
        plinkCommand += ["--extract", options.extract]

    # The subset command for samples
    if options.keep is not None:
        plinkCommand += ["--keep", options.keep]
    elif options.remove is not None:
        plinkCommand += ["--remove", options.remove]

    # The output prefix
    plinkCommand += ["--out", options.out]

    # Running the command
    runCommand(plinkCommand)
Subset the data.

    :param options: the options.

    :type options: argparse.Namespace

    Subset the data using either ``--exclude`` or ``--extract``for markers or
    ``--remove`` or ``keep`` for samples.