Python 转换具有numpy数组的列将其转换为以dtype作为对象的numpy数组

Python 转换具有numpy数组的列将其转换为以dtype作为对象的numpy数组,python,python-3.x,pandas,numpy,Python,Python 3.x,Pandas,Numpy,我在数据帧中有一个列,它的numpy数组长度为10。我的数据帧如下所示: 0 [2.0, 1246.0, 82.0, 43.0, 569.0, 46.0, 424.0, ... 1 [395.0, 2052.0, 1388.0, 8326.0, 5257.0, 176.0,... 10 [4.0, 1.0, 13.0, 1409.0, 7742.0, 259.0, 1856.0... 100 [4.0, 87.0, 1595.0, 706.0, 2935

我在数据帧中有一个列,它的numpy数组长度为10。我的数据帧如下所示:

0       [2.0, 1246.0, 82.0, 43.0, 569.0, 46.0, 424.0, ...
1       [395.0, 2052.0, 1388.0, 8326.0, 5257.0, 176.0,...
10      [4.0, 1.0, 13.0, 1409.0, 7742.0, 259.0, 1856.0...
100     [4.0, 87.0, 1595.0, 706.0, 2935.0, 6028.0, 442...
1000    [45.0, 582.0, 124.0, 6530.0, 6548.0, 748.0, 61...
Name: embedding1, dtype: object
array([array([   2., 1246.,   82.,   43.,  569.,   46.,  424.,  446., 1054., 39.]),

       array([4.0000e+00, 1.0000e+00, 1.3000e+01, 1.4090e+03, 7.7420e+03,
       2.5900e+02, 1.8560e+03, 3.6181e+04, 4.2000e+01, 8.9000e+02]),
       ...,
       array([4.000e+00, 1.000e+00, 1.300e+01, 2.900e+01, 4.930e+02, 2.760e+02,1.100e+01, 6.770e+02, 6.740e+02, 5.806e+03]),], dtype=object)
当我使用以下命令将其转换为数组的numpy数组时:

input = np.asarray(df.tolist())
input1 = np.asarray(df1.tolist(),dtype=np.float)
它给出的数组如下所示:

0       [2.0, 1246.0, 82.0, 43.0, 569.0, 46.0, 424.0, ...
1       [395.0, 2052.0, 1388.0, 8326.0, 5257.0, 176.0,...
10      [4.0, 1.0, 13.0, 1409.0, 7742.0, 259.0, 1856.0...
100     [4.0, 87.0, 1595.0, 706.0, 2935.0, 6028.0, 442...
1000    [45.0, 582.0, 124.0, 6530.0, 6548.0, 748.0, 61...
Name: embedding1, dtype: object
array([array([   2., 1246.,   82.,   43.,  569.,   46.,  424.,  446., 1054., 39.]),

       array([4.0000e+00, 1.0000e+00, 1.3000e+01, 1.4090e+03, 7.7420e+03,
       2.5900e+02, 1.8560e+03, 3.6181e+04, 4.2000e+01, 8.9000e+02]),
       ...,
       array([4.000e+00, 1.000e+00, 1.300e+01, 2.900e+01, 4.930e+02, 2.760e+02,1.100e+01, 6.770e+02, 6.740e+02, 5.806e+03]),], dtype=object)
它给出的类型是object。我希望对象是浮动的,因为它给出了形状(1000,),但我希望形状是(1000,10)。我试过使用这个:

input = np.asarray(df.tolist())
input1 = np.asarray(df1.tolist(),dtype=np.float)
但它给出了以下错误:

ValueError: setting an array element with a sequence.
如何解决这个问题


PS:dataframe的row numpy数组的所有元素都是浮点类型的

首先,看起来您有一个
pd.Series
而不是一个数据帧

以设置为例:

x = [[2.0, 1246.0, 82.0, 43.0, 569.0, 46.0, 424.0],
[395.0, 2052.0, 1388.0, 8326.0, 5257.0, 176.0],
[4.0, 1.0, 13.0, 1409.0, 7742.0, 259.0, 1856.0],
[4.0, 87.0, 1595.0, 706.0, 2935.0, 6028.0, 442],
[45.0, 582.0, 124.0, 6530.0, 6548.0, 748.0, 61]]

s = pd.Series(x)
产生

0      [2.0, 1246.0, 82.0, 43.0, 569.0, 46.0, 424.0]
1     [395.0, 2052.0, 1388.0, 8326.0, 5257.0, 176.0]
2    [4.0, 1.0, 13.0, 1409.0, 7742.0, 259.0, 1856.0]
3    [4.0, 87.0, 1595.0, 706.0, 2935.0, 6028.0, 442]
4    [45.0, 582.0, 124.0, 6530.0, 6548.0, 748.0, 61]
dtype: object
您有一个
pd.Series
数组。看起来你想把它弄平。在列表列表中使用默认构造函数会生成一个数据帧,其中每个列表都被解释为一行:

df2 = pd.DataFrame(s.tolist())

    0       1       2       3       4       5       6
0   2.0     1246.0  82.0    43.0    569.0   46.0    424.0
1   395.0   2052.0  1388.0  8326.0  5257.0  176.0   NaN
2   4.0     1.0     13.0    1409.0  7742.0  259.0   1856.0
3   4.0     87.0    1595.0  706.0   2935.0  6028.0  442.0
4   45.0    582.0   124.0   6530.0  6548.0  748.0   61.0
现在,您只需获取访问数据帧的底层
np.array
。value

df2.values

array([[2.000e+00, 1.246e+03, 8.200e+01, 4.300e+01, 5.690e+02, 4.600e+01,
        4.240e+02],
       [3.950e+02, 2.052e+03, 1.388e+03, 8.326e+03, 5.257e+03, 1.760e+02,
              nan],
       [4.000e+00, 1.000e+00, 1.300e+01, 1.409e+03, 7.742e+03, 2.590e+02,
        1.856e+03],
       [4.000e+00, 8.700e+01, 1.595e+03, 7.060e+02, 2.935e+03, 6.028e+03,
        4.420e+02],
       [4.500e+01, 5.820e+02, 1.240e+02, 6.530e+03, 6.548e+03, 7.480e+02,
        6.100e+01]])

您有一个数组。内部数组是
dtype
float,但是外部数组-保存所有float-dtype数组对象的数组-必须是
dtype
object您没有指定足够的内容让我们知道,但是如果让我猜,我想说你只需要
df.values
@RafaelC我对这个问题做了一些编辑来解释。@RafaelC df.values给出了同样的答案output@RafaelC成功了。你能在回答中详细解释一下吗。