rpy2: compatibiliity issue 2.0.6 vs 2.3.8

Question

The following works in rpy2 2.0.6:

robjects.r('M = lm(...)')
M = robjects.r('M')
coefficients = M.r['coefficients'][0]

But after I upgraded to rpy2 2.3.8, the above fails with the message

AttributeError: 'ListVector' object has no attribute 'r'

What do I need to change to make this work in 2.3.8?

Answer 1

I am not certain that the code snippet you provide worked with rpy2-2.0.x

The documentation, section Introduction, is showing how to extract coefficients from linear models:

http://rpy.sourceforge.net/rpy2/doc-2.1/html/introduction.html#linear-models