Choosing key and value from a dataframe

[Beta]

Hi,

This is again a very basic question in RHadoop environment programming.

Suppose I've a dataframe, say airlines data. Now I want to summarize flights delay by airline (e.g. AA, UA). My question is how will I choose key-value pair from the airline dataframe.

I tried Jeffery Breen's example. He did v['variable_name'] to select key and value variable. But when I'm trying using some other example I'm getting error.

One of the Jeffery Breen's example I tried.

https://github.com/jeffreybreen/tutorial-201209-TDWI-big-data/blob/master/R/2-airline.R

I'll be extremely grateful if somebody can share an example code. 

Regards.

[Antonio Piccolboni]

with rmr2

 from.dfs(mapreduce(to.dfs(mtcars), map = function(k,v) keyval(v$gear, v), reduce = function(k,v) t(colMeans(v))))

with plyrmr

 input(mtcars) %|% group(gear) %|% gapply(function(x) t(colMeans(x)))

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[Beta]

Thanks a Lot Antonio! You had been most helpful. I was trying the code with rmr2 and you solution worked.