def get_daily_events(da, da_value, operator):
    r"""
    function that returns a 0/1 mask when a condition is True or False

    the function returns 1 where operator(da, da_value) is True
                         0 where operator(da, da_value) is False
                         nan where da is nan

    Parameters
    ----------
    da : xarray.DataArray
    da_value : float
    operator : string


    Returns
    -------
    xarray.DataArray

    """
    events = operator(da, da_value) * 1
    events = events.where(~np.isnan(da))
    events = events.rename('events')
    return events