On 2/18/10 5:17 PM, Luca Beltrame wrote:
> Hello,
>
> In my porting effort (using a frequently updated rpy2.1 copy from mercurial) I
> found myself in the necessity of subsetting values from a DataFrame. In R I
> would do this, for example
>
> subset(my_data_frame, Column_name> 0)
>
> however in Python keywords cannot be expressions.
>
> How would I handle such a case?
Currently, you will have to repeat the data.frame in which the column of
interest is located.
base = importr('base')
base.subset(my_data_frame, my_data_frame.rx('Column_name').ro > 0)
L.
PS: Operators such as ">" and "<" are only available in a very recent
snapshot for rpy2-2.1dev. Example from the documentation:
x.rx(x.ro > 3) # extract values > 3
i = (x.ro >= 2 ).ro & (x.ro <= 4) # extract values between 2 and 4
x.rx(i)
PPS: The required use of .ro may disappear. More about that on in an
other email to the list
> Thanks!
>
>
>
>
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