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.


>>> import as ma
>>> dtype = np.dtype({'names':['foo', 'bar'],
>>> 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_'>

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