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Combine two or more columns in a dataframe into a new column with a new name（9个回答）
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我有一个dataframe如下：

ID  GRgroup ARgroup
MB-0000 High    Moderate
MB-0002 Moderate    High
MB-0005 High    High
MB-0006 Moderate    Low
MB-0008 High    Low
MB-0010 High    Moderate

我想连接第二和第三列。预期输出为：

ID  GRgroup ARgroup ARGR
MB-0000 High    Moderate    AR:Moderate_GR:High
MB-0002 Moderate    High    AR:High_GR:Moderate
MB-0005 High    High    AR:High_GR:High
MB-0006 Moderate    Low AR:Low_GR:Moderate
MB-0008 High    Low AR:Low_GR:High
MB-0010 High    Moderate    AR:Moderate_GR:High

我在Python中这样做了：

import pandas as pd

# Concatenate 'GRgroup' and 'ARgroup' columns with the desired format
df['ARGR'] = "AR:" + df['ARgroup'] + "_GR:" + df['GRgroup']

# Reorder the columns
df = df[['ID', 'GRgroup', 'ARgroup', 'ARGR']]

在R中该怎么做？