# numpy.ma.make_mask_descr

ma.make_mask_descr(ndtype)

  Construct a dtype description list from a given dtype.

  Returns a new dtype object, with the type of all fields in ndtype to a boolean type. Field names are not altered.

  Parameters:
    ndtype dtype

      The dtype to convert.

  Returns:
    result dtype

      A dtype that looks like ndtype, the type of all fields is boolean.

  Examples

      >>> import numpy.ma as ma
      >>> dtype = np.dtype({'names':['foo', 'bar'],
      ...                   'formats':[np.float32, np.int64]})
      >>> dtype
      dtype([('foo', '<f4'), ('bar', '<i8')])
      >>> ma.make_mask_descr(dtype)
      dtype([('foo', '|b1'), ('bar', '|b1')])
      >>> ma.make_mask_descr(np.float32)
      dtype('bool')