With the new alpha,
z.subset('y')[0]
can also be written as
z.r['y'][0]
I am sometimes checking with R-devel and Python-2.6, and last time
I did it was doing ok.
Thanks for reporting any error you would notice.
To run the automated tests (and see that there are still issues with the
current R and Python):
import rpy2.tests
import unittest
suite = rpy2.tests.suite()
# increase the verbosity level if needed
unittest.TextTestRunner(verbosity=0).run(suite)
2008/6/26 Sean Davis <[EMAIL PROTECTED]>:
> On Wed, Jun 25, 2008 at 5:30 PM, Laurent Gautier <[EMAIL PROTECTED]> wrote:
>> 2008/6/25 Sean Davis <[EMAIL PROTECTED]>:
>>> First, Laurent, I am giving rpy2 a try and REALLY like what I see so
>>> far. It is very much more intuitive, both from the point-of-view of
>>> an R programmer as well as for python programmers.
>>>
>>> Data frames are very nice R data structures, so I would like to
>>> capitalize on them and the changes included in rpy2 as much as
>>> possible. So, how can I access the members of y (the data.frame)? If
>>> one uses list subsetting, the values are actually reversed. I figured
>>> out that y.getNames() will return the names of z, which I can then use
>>> to determine the list position. Is there a way to do this with the
>>> column names directly?
>>>
>>> In [34]: z = ro.r['data.frame'](x=ro.r.c(1,2,3,4),y=ro.r.c(5,6,7,8))
>>>
>>> In [35]: z
>>> Out[35]:
>>> structure(list(y = 5:8, x = 1:4), .Names = c("y", "x"), row.names = c(NA,
>>> -4L), class = "data.frame")
>>>
>>> In [36]: z[0]
>>> Out[36]: 5:8
>>>
>>> In [37]: z[0][1]
>>> Out[37]: 6
>>>
>>> In [38]: z.getNames()
>>> Out[38]: c("y", "x")
>>>
>>
>>
>> z.subset('y')
>> returns a list, because data.frames are R lists, and R lists are
>> recursive structures.
>>
>> z.subset('y')[0]
>> should make it.
>>
>> The method "subset" mimics R's "[". There is probably the need for a
>> counterpart to R's "[[".
>>
>> There will also be a proper class for data.frame (but that will be in July).
>
> Great. I look forward to it! Oh, by the way, I am doing my testing
> on R-devel and things are going fine.
>
> Sean
>
>>> Thanks,
>>> Sean
>>>
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