我無法根據條件替換列上的值

Question

我試圖將列替換為基於條件的值（基本上，我試圖在此列中創建索引類以進行多項邏輯回歸）

我嘗試使用DataFrame.loc，但總是收到相同的錯誤

誰能幫我解決這個問題？

data.loc[(data['Freq_Rech'] < 3), 'Freq_Rech'] = 1
data.loc[(data['Freq_Rech'] >= 3) & (data['Freq_Rech'] < 6), 'Freq_Rech'] = 3
data.loc[data['Freq_Rech'] >= 6 & data['Freq_Rech'] < 10, 'Freq_Rech'] = 6
data.loc[data['Freq_Rech'] >= 10 & data['Freq_Rech'] < 20, 'Freq_Rech'] = 10
data.loc[data['Freq_Rech'] >= 20, 'Freq_Rech'] = 20

錯誤是：無法將dtyped [float64]數組與類型為[bool]的標量進行比較

Answer 1

你快到了 只要確保您的布爾條件周圍有正確的語法即可：

data.loc[(data['Freq_Rech'] < 3), 'Freq_Rech'] = 1
data.loc[(data['Freq_Rech'] >= 3) & (data['Freq_Rech'] < 6), 'Freq_Rech'] = 3
data.loc[(data['Freq_Rech'] >= 6) & (data['Freq_Rech'] < 10), 'Freq_Rech'] = 6
data.loc[(data['Freq_Rech'] >= 10) & (data['Freq_Rech'] < 20), 'Freq_Rech'] = 10
data.loc[(data['Freq_Rech'] >= 20), 'Freq_Rech'] = 20