[Numpy-discussion] Nested recarrays with subarrays and loadtxt: a bug in loadtxt?

Pierre GM pgmdevlist@gmail....
Wed May 27 17:01:30 CDT 2009


On May 27, 2009, at 5:53 PM, Fernando Perez wrote:

> Howdy,
>
> I'm wondering if the code below illustrates a bug in loadtxt, or just
> a 'live with it' limitation.

Have you tried np.lib.io.genfromtxt ?

dt = dtype(dict(names=['name','x','y','block'],
                 formats=['S4',float,float,(int,(2,3))]))
txtdata = StringIO("""
# name  x       y       block - 2x3 ints
aaaa	1.0	8.0	1 2 3 4 5 6
aaaa	2.0	7.4	2 11 22 3 4 5 6
bbbb	3.5	8.5	3 0 22 44 5 6
aaaa	6.4	4.0	4 1 3 33 54 65
aaaa	8.8	4.1	5 5 3 4 44 77
bbbb	5.5	9.1	6 3 4 5 0 55
bbbb	7.7	8.5	7 2 3 4 5 66
""")
alt_data = np.lib.io.genfromtxt(txtdata,dtype=dt)

array([('aaaa', 1.0, 8.0, [[1, 1, 1], [1, 1, 1]]),
        ('aaaa', 2.0, 7.4000000000000004, [[2, 2, 2], [2, 2, 2]]),
        ('bbbb', 3.5, 8.5, [[3, 3, 3], [3, 3, 3]]),
        ('aaaa', 6.4000000000000004, 4.0, [[4, 4, 4], [4, 4, 4]]),
        ('aaaa', 8.8000000000000007, 4.0999999999999996, [[5, 5, 5],  
[5, 5, 5]]),
        ('bbbb', 5.5, 9.0999999999999996, [[6, 6, 6], [6, 6, 6]]),
        ('bbbb', 7.7000000000000002, 8.5, [[7, 7, 7], [7, 7, 7]])],
       dtype=[('name', '|S4'), ('x', '<f8'), ('y', '<f8'), ('block',  
'<i4', (2, 3))])

Is this what you want?



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