Thanks Mark and Laurent, your suggestions were very useful. Turning off
RPy conversion helped me a lot; I'll check later the rpy2 thing. Thank
you very much.
En/na Laurent Gautier ha escrit:
> Albert Meroño Peñuela wrote:
>> Hello everyone,
>>
>> I'm writing a little script in Python which intends to sort a table
>> of word frequency in a text, using R functions from rpy package. I've
>> got my word list; when I use the R table function I obtain a list
>> which contains que frequencies, but *not* the word names:
>>
>> #!/usr/bin/python
>> from rpy import *
>> ...
>> file = open("input.txt")
>> filecontent = file.read()
>> filecontent = r.tolower(filecontent)
>> words = r.strsplit(filecontent, " ")
>> wordsvector = r.unlist(words)
>> table = r.table(wordsvector)
>> ...
>> print table
>> print r.names(table)
>>
>> [1. 1. 1. 2. 3.]
>> None
>>
>> When I do something similar in R console, calling 'names(table)'
>> returns the name of the word for each frequency value. Why is this
>> not going that way in Python using rpy?
>>
>> Thanks in advance,
>
> This is likely happening because rpy is converting the object on the
> fly (and is dropping the name information on the way, as python
> tuples/lists have no name for their elements).
>
> Turning off the conversion might be the way to solve this.
>
>
> With rpy2 this is tentatively more straightforward to achieve.
>
> Example with version 2.0.4:
>
> >>> import rpy2.robjects as ro
> >>> tab = ro.r["table"](ro.r["rpois"](100,5))
> >>> print(tab)
> 0 1 2 3 4 5 6 7 8 9 10 11
> 2 6 10 12 12 20 14 19 2 1 1 1
> >>> tuple(tab.names[0])
> ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11')
>
--
Albert Meroño Peñuela
Institut de Dret i Tecnologia UAB
UAB Institute of Law and Technology
Political Science and Public Law Department
Campus UAB. Edifici B. Facultat de Dret
08193 Bellaterra. Barcelona. Spain.
Tel: +34 93 581 22 35
Fax: +34 93 581 29 88
http://idt.uab.es/
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