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[英]Can I use rpy2 to save a pandas dataframe to an .Rdata file?
[英]rpy2 - how to save dataframe as RData file to disk?
我想知道如何将pandas数据帧保存到.RData
文件中,如何从pandas数据帧保存到RData? 我有一切到这里的最后一步:
import pandas as pd
import rpy2
from rpy2 import robjects
from rpy2.robjects import pandas2ri
pandas2ri.activate()
# load RData file
df = pandas2ri.ri2py(robjects.r['get'](robjects.r['load'](path_to_rdata_file)))
.... do some processing to df ...
# save df as RData file
r_df = pandas2ri.py2ri(df)
??????????
如何将pandas数据作为.RData
文件保存到磁盘?
我终于想出了答案,这里是你如何使用pandas dataframe写入.RData
文件:
首先将数据帧转换为R数据帧:
r_data = pandas2ri.py2ri(df)
然后我们必须将数据帧分配给“R工作区”中的变量:
robjects.r.assign("my_df", r_data)
最后,我们可以通过名称引用变量来调用save
命令:
robjects.r("save(my_df, file='{}')".format(filename))
如果你想读/写RData文件但是在python中使用pandas,这里有2个辅助函数:
# read .RData file as a pandas dataframe def load_rdata_file(filename): r_data = robjects.r['get'](robjects.r['load'](filename)) df = pandas2ri.ri2py(r_data) return df # write pandas dataframe to an .RData file def save_rdata_file(df, filename): r_data = pandas2ri.py2ri(df) robjects.r.assign("my_df", r_data) robjects.r("save(my_df, file='{}')".format(filename)) os.chmod(filename, 0o777)
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