通过 rpy2 将列表从 python 传递到 R [英] Pass list from python to R through rpy2

问题描述

我正在尝试通过 rpy2.这就是我想要实现的目标:

I'm trying to make a simple call to a R package (ks) from within python through rpy2. This is what I would like to achieve:

import rpy2.robjects as robjects

# Define two matrices.
matrix1 = [[1,1,1,1], [3,3,3,3]]
matrix2 = [[1,1,1,1], [3,3,3,3]]

# Call 'ks' function to obtain p_value.
p_val = robjects.r('''
library(ks)
kde.test(x1=matrix1, x2=matrix2)$pvalue''')

print p_val

我尝试遵循 rpy2 的文档 但它非常稀缺.任何帮助将不胜感激.

I tried following the documentation from rpy2 but it is very scarce. Any help would be appreciated.

推荐答案

根据 lgautier 因为那个没有按原样工作.我还通过传递 nrow 而不是固定它来使它更通用.

Posting my own answer based on the one given by lgautier since that one did not work as is. I also made it a bit more general by passing nrow instead of having it fixed.

import rpy2.robjects as robjects
from rpy2.robjects.packages import importr
ks = importr('ks')

kde_test = ks.kde_test

matr1 = [1., 3., 1., 3., 0.2, 1.5, 0.5, 1.3]
matr2 = [1., 3., 1., 3., 0.2, 1.5, 0.5, 1.3, 0.5, 4.6]  

m1 = robjects.r.matrix(robjects.FloatVector(matr1), nrow=int(len(matr1)/2), byrow=True)
m2 = robjects.r.matrix(robjects.FloatVector(matr2), nrow=int(len(matr2)/2), byrow=True)

res = kde_test(x1 = m1, x2 = m2)

pval = res.rx2('pvalue')

print float(str(pval)[4:])

所有的功劳都归功于 lgautier 提出的解决方案，即使它一开始没有奏效.

All credit goes to lgautier for proposing the solution even if it did not work at first.

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