numpy.ma.make_mask_descr

numpy.ma.make_mask_descr(ndtype) [source]

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.int]})
>>> dtype
dtype([('foo', '<f4'), ('bar', '<i4')])
>>> ma.make_mask_descr(dtype)
dtype([('foo', '|b1'), ('bar', '|b1')])
>>> ma.make_mask_descr(np.float32)
<type 'numpy.bool_'>