[R] data.frame package?

[Witold Eryk Wolski]

Is there a library that is able for example to
1. merge 2 dataframes by row  eg.: rbind(dataframe1, dataframe2):data.frame
2. delete a column from a dataframe del(dataframe, colname) or 
del(dataframe, colindex= 1):data.frame?
3. Select lines from a dataframe by a specific function ? 
select(dataframe, func=small(x){x<1}, colindex=3): data.frame?
4. converting all double columns of a data.frame to a matrix. 
datafram_to_matrix(dataframe1):matrix

If not would not it be usefull to have such a library on the cran?

Sincerely
Eryk


-- 
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   Eryk Witold Wolski         .^.
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wolski at molen.mpg.de
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http://www.molgen.mpg.de/~mass-spec
http://www.molgen.mpg.de/~wolski


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