将高维R数据集加载到Pandas DataFrame中

Question

一些R数据集可以很容易地加载到Pandas DataFrame或Panel中:

import pandas.rpy.common as com
infert = com.load_data('infert')
print(infert.head())

只要R数据集的维度<= 3,这似乎就有效.更高维度的数据集会打印错误消息:

In [67]: com.load_data('Titanic')
Cannot handle dim=4

此错误消息源自rpy/common.py _convert_array函数.

当然,Pandas不能直接将4维矩阵用于数据框架或面板,但有一些解决方法可以将数据集加载Titanic到DataFrame(可能带有分层索引)吗？

Answer 1

使用@joran非常有用的建议,安装reshape包后

% sudo R
R> install.packages('reshape')

我设法将Titanic数据集加载到Pandas DataFrame中:

import pandas as pd
import pandas.rpy.common as com
import rpy2.robjects as ro

r = ro.r
r('library(reshape)')
df = com.convert_robj(r('melt(Titanic)'))
print(df.head())

印刷的

  Class     Sex    Age Survived  value
1   1st    Male  Child       No      0
2   2nd    Male  Child       No      0
3   3rd    Male  Child       No     35
4  Crew    Male  Child       No      0
5   1st  Female  Child       No      0

Answer 2

使用Pandas 0.13.0 或更高版本，pandas.rpy.common.load_data可以加载更高维度的数据集，例如Titanic：

import pandas.rpy.common as com
df = com.load_data('Titanic')
print(df.head())

产量

  Survived    Age     Sex Class value
0       No  Child    Male   1st   0.0
1       No  Child    Male   2nd   0.0
2       No  Child    Male   3rd  35.0
3       No  Child    Male  Crew   0.0
4       No  Child  Female   1st   0.0