python資料處理庫numpy、pandas陣列操作
阿新 • • 發佈:2019-02-08
1.numpy
1.1陣列行列
import numpy as np
data_np=np.array(data)
data_col=data_np[:,2:]
data_row=data_np[]
1.2陣列拼接
- 按列拼接
data_cat_col=np.concatenate((data_left, data_right), axis=1)
- 按行拼接1
data_cat_row=np.concatenate((data_top, data_button), axis=0)
- 按行拼接2
data_cat_row=np.row_stack((data_top, data_button ))
2.pandas
2.1陣列行列
import pandas as pd
data=pd.DataFrame(data)
//#列:取陣列中最後一列之前的資料到新陣列中
data_col=data[data.columns[:-1]]
//#行:取陣列中的前3行到新陣列中
data_row=data.iloc[:3,]
2.2資料拼接
按列拼接
按行拼接1
data_out=data_out.append(data_in)
3.資料按行隨機化
from sklearn.utils import shuffle
data_row_random=shuffle(data_in)