axis direction codes for affine aff
Parameters: | aff : (N,M) array-like
labels : optional, None or sequence of (2,) sequences
tol : None or float
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Returns: | axcodes : (N,) tuple
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Examples
>>> aff = [[0,1,0,10],[-1,0,0,20],[0,0,1,30],[0,0,0,1]]
>>> aff2axcodes(aff, (('L','R'),('B','F'),('D','U')))
('B', 'R', 'U')