genfromtxt

genfromtxtで、カラム数1のデータをgenfromtxtすると、多次元配列にならない

>>> import numpy as np
>>> from StringIO import StringIO
>>> data = "1, 2, 3\n4, 5, 6"
>>> np.genfromtxt(StringIO(data), delimiter=",")
array([[1., 2., 3.],
       [4., 5., 6.]])
>>> data = "1\n2"
>>> np.genfromtxt(StringIO(data), delimiter=",")
array([1., 2.])
>>> np.genfromtxt(StringIO(data), delimiter="\n")
array([1., 2.])

http://lagrange.univ-lyon1.fr/docs/numpy/1.11.0/user/basics.io.genfromtxt.html