Hello, in an effort to create a conversion between pandas objects[1] and R's data.frames, I'm trying to add columns to an empty DataFrame.
Python code:
from rpy2.robjects.packages import importr
base = importr("base")
my_row_names =
empty = base.data_frame(row_names=[item for item in range(1000)] )
Problems arise when I try to add a column through the rx2 accessor:
empty.rx2["New"] = [str(item) for item in range(len(empty.rownames))]
RRuntimeError: Error in `[[<-.data.frame`(list(), "New", list("0", "1", "2",
"3", "4", : argument "value" is missing, with no default
Anything I'm doing wrong? Or is there a more efficient way? (For reference,
I'm trying to *avoid* creating taggedlists and so on because they involve
intermediates, and with large objects that would mean performance issues).
[1] http://pandas.pydata.org
--
Luca Beltrame, Ph.D. - Translational Genomics Unit
Oncology Department, Mario Negri Institute
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