[英]How to use `numpy.hstack()` with `numpy.ndarray` data type?
I have a numpy.DataFrame
say df
with 3 columns, col_1
, col_2
, col_3
.我有一个
numpy.DataFrame
说df
有 3 列col_1
, col_2
, col_3
。 Data in col_1
are numpy.ndarray
and looks like this: array([ 0.216, -0.290, 0.349])
col_1
中的数据是numpy.ndarray
,如下所示: array([ 0.216, -0.290, 0.349])
How could I use np.hstack() to expand the DataFrame
with columns consist of each data point in col_1
?我如何使用 np.hstack() 来扩展
DataFrame
,其中列由col_1
中的每个数据点组成?
ie Original DataFrame即原装DataFrame
col_1 col_2 col_3
------------------------------------------------------
0 [0.216, -0.290, 0.349] NORMAL N09_M07_F10_K001_1
Supposed DataFrame假设 DataFrame
col_3 col_2 0 1 2
------------------------------------------------
0 N09_M07_F10_K001_1 NORMAL 0.216 -0.290 0.349
I'd tried like this:我试过这样:
Supposed_DataFrame = pd.concat(
[df[['label', 'filename']],
pd.DataFrame(np.hstack(df["signal"].values).T)
],
axis=1)
but the output was:但 output 是:
col_3 col_2 0
-----------------------------------
0 N09_M07_F10_K001_1 NORMAL 0.216
any simpler solutions will be appreciated任何更简单的解决方案将不胜感激
Check out this code:看看这段代码:
import pandas as pd
dict_ = {
'col_1': [[0.216, -0.290, 0.349]],
'col_2': 'NORMAL',
'col_3': 'N09_M07_F10_K001_1'
}
df2 = pd.DataFrame(dict_)
supposed_DataFrame = pd.concat([df2[['col_3', 'col_2']], pd.DataFrame(df2['col_1'].to_list(), columns=[0,1,2])], axis=1)
print (supposed_DataFrame)
Method-2 : using basic steps:方法2 :使用基本步骤:
row_1 = df2['col_1'][0]
for i in range(len(row_1)):
df2[i] = row_1[i]
df2.drop('col_1', axis=1, inplace=True)
print(df2)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.