[Rpy] names of columns in dataframe

[Anne Ghisla]

Hi list,

I'm using packaged rpy2 on Debian Squeeze in a python-grass script to
perform kriging and, among other things that rpy2 executes smoothly, I
need tho change the names of two columns in a dataframe.
This edit is necessary because the dataframe coming from previous
as.data.frame command receives arbitrary column names.

Picking up some sample code:

d = {'value': robjects.IntVector((1,2,3)),
     'letter': robjects.StrVector(('x', 'y', 'z'))}
dataf = robjects.r['data.frame'](**d)

For example, I need to change 'letter' column name into 'code'
without modifying its content neither other columns. In R I would have
written:

names(dataf) = c("value", "code")

I tried alternatively:

dataf.names = robjects.r.gsub('letter','code',dataf.names)
dataf.names = robjects.r.c('value','code')

with no success. The error says that dataf.names doesn't support
assignment. Also I didn't succeed in handling it as Python object, as
the type is RVector.
Gsub works when I assing the result to a copy of dataf.names.

Any suggestion and link to docs/examples will be appreciated.

thanks in advance
Anne

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