Using R from Python rpy2

Today I installed R (vesion2.11.1 2010.5.31) from mac installer.
R is an enviroment for statistical computing and graphics.
Python has some packages for R like rpy and rpy2.

Here is my install log.

install numpy and rpy2 via pip

pip install numpy
pip install rpy2

import rpy2.robjects as robjects                                                                                
                                                                                                                
ctl = robjects.FloatVector([4.17, 5.58, 5.18, 6.11, 4.50,                                                       
                            4.61, 5.17, 4.53, 5.33, 5.14])                                                      
trt = robjects.FloatVector([4.81, 4.17, 4.41, 3.59, 5.87,                                                       
                            3.83, 6.03, 4.89, 4.32, 4.69])                                                      
                                                                                                                
correlation = robjects.r('function(x, y) cor.test(x, y)')                                                       
print correlation(ctl, trt)                                                                                     

$ python Desktop/correlation_sample.py

	Pearson's product-moment correlation

data:  x and y 
t = -1.4559, df = 8, p-value = 0.1835
alternative hypothesis: true correlation is not equal to 0 
95 percent confidence interval:
 -0.8440680  0.2415684 
sample estimates:
       cor 
-0.4576683