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[英]Create a new column in a pandas dataframe based on values found on a previous row
[英]How to create a new column based on row value in previous row in Pandas dataframe?
您可以首先對日期列進行sort_values
以確保它們以正確的順序執行比較,然后您可以使用np.where
和shift()
將 Adj Close 中的前一個值與當前值進行比較:
# Sort by date
df.sort_values(by='Date',ascending=True)
# Create a column comparing previous Adj Close with current Adj Close
import numpy as np
df['i'] = np.where(df['Adj Close'].shift(1) < df['Adj Close'],1,0)
df
Date Open High ... Adj Close Volume i
index ...
1297 2021-03-01 104.540001 133.990005 ... 120.40 49597300 0
1298 2021-03-02 116.930000 133.199900 ... 118.18 33640400 0
1299 2021-03-03 122.500000 127.700000 ... 124.18 19173700 1
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