Mask an array where less than or equal to a given value.
This function is a shortcut to masked_where, with condition = (x <= value).
See also
Examples
>>> import numpy.ma as ma
>>> a = np.arange(4)
>>> a
array([0, 1, 2, 3])
>>> ma.masked_less_equal(a, 2)
masked_array(data = [-- -- -- 3],
      mask = [ True  True  True False],
      fill_value=999999)