我有以下返回不同的结构化数据:NumPy的的genfromtxt取决于D型参数
from numpy import genfromtxt
seg_data1 = genfromtxt('./datasets/segmentation.all', delimiter=',', dtype="|S5")
seg_data2 = genfromtxt('./datasets/segmentation.all', delimiter=',', dtype=["|S5"] + ["float" for n in range(19)])
print seg_data1
print seg_data2
print seg_data1[:,0:1]
print seg_data2[:,0:1]
事实证明,seg_data1
和seg_data2
是不一样的一种结构。下面是打印:
[['BRICK' '140.0' '125.0' ..., '7.777' '0.545' '-1.12']
['BRICK' '188.0' '133.0' ..., '8.444' '0.538' '-0.92']
['BRICK' '105.0' '139.0' ..., '7.555' '0.532' '-0.96']
...,
['CEMEN' '128.0' '161.0' ..., '10.88' '0.540' '-1.99']
['CEMEN' '150.0' '158.0' ..., '12.22' '0.503' '-1.94']
['CEMEN' '124.0' '162.0' ..., '14.55' '0.479' '-2.02']]
[ ('BRICK', 140.0, 125.0, 9.0, 0.0, 0.0, 0.2777779, 0.06296301, 0.66666675, 0.31111118, 6.185185, 7.3333335, 7.6666665, 3.5555556, 3.4444444, 4.4444447, -7.888889, 7.7777777, 0.5456349, -1.1218182)
('BRICK', 188.0, 133.0, 9.0, 0.0, 0.0, 0.33333334, 0.26666674, 0.5, 0.077777736, 6.6666665, 8.333334, 7.7777777, 3.8888888, 5.0, 3.3333333, -8.333333, 8.444445, 0.53858024, -0.92481726)
('BRICK', 105.0, 139.0, 9.0, 0.0, 0.0, 0.27777782, 0.107407436, 0.83333325, 0.52222216, 6.111111, 7.5555553, 7.2222223, 3.5555556, 4.3333335, 3.3333333, -7.6666665, 7.5555553, 0.5326279, -0.96594584)
...,
('CEMEN', 128.0, 161.0, 9.0, 0.0, 0.0, 0.55555534, 0.25185192, 0.77777785, 0.16296278, 7.148148, 5.5555553, 10.888889, 5.0, -4.7777777, 11.222222, -6.4444447, 10.888889, 0.5409177, -1.9963073)
('CEMEN', 150.0, 158.0, 9.0, 0.0, 0.0, 2.166667, 1.6333338, 1.388889, 0.41851807, 8.444445, 7.0, 12.222222, 6.111111, -4.3333335, 11.333333, -7.0, 12.222222, 0.50308645, -1.9434487)
('CEMEN', 124.0, 162.0, 9.0, 0.11111111, 0.0, 1.3888888, 1.1296295, 2.0, 0.8888891, 10.037037, 8.0, 14.555555, 7.5555553, -6.111111, 13.555555, -7.4444447, 14.555555, 0.4799313, -2.0293121)]
[['BRICK']
['BRICK']
['BRICK']
...,
['CEMEN']
['CEMEN']
['CEMEN']]
Traceback (most recent call last):
File "segmentationdata.py", line 14, in <module>
print seg_data2[:,0:1]
IndexError: too many indices for array
我宁愿在seg_data1
形式genfromtxt
返回数据,虽然我不知道任何内置的方式来强制seg_data2
符合该类型。据我所知有没有简单的办法:
seg_target1 = seg_data1[:,0:1]
seg_data1 = seg_data1[:,1:]
seg_data2
。现在我可以做data.astype(float)
但重点是,是不是genfromtxt
应该做的开始,当我给它dtype
数组?
到底是什么'[“| S5”] + [“浮动”对于范围内的n(19)]'假设代表dtype? –
我不太明白你想要做什么。你说你会*'而不是'genfromtxt'以'seg_data1'' *的形式返回数据,那么'seg_data1'有什么问题?看起来你可能会把结构化数组中的* fields *与多维数组中的* columns *混淆起来。字段可以有不同的dtype,但列不能。如果你想要一个数据结构,其中“列”可以有不同的dtypes,那么你可能想使用['pandas.DataFrame'](http://pandas.pydata.org/pandas-docs/stable/generated/pandas。 DataFrame.html)。 –
'panda.DataFrame'是否使用结构化数组存储其数据?或者'dtype = object'数组?或者取决于什么方便? – hpaulj